Foxy's Slow-Slow Fruit ability is indeed somewhat abnormal. It's Paramecia- type ability that operates on rules. Rebecca's current Haki isn't enough to eliminate the effects of this ability. She has great strength but can't use it, and is directly controlled by the rules, which is very frustrating.
"I see you four have some skill, it's a waste for you to stay in the Navy. Join our Foxy Pirates, and I guarantee you'll live the high life. Join us, and we'll be family. If you agree, I'll release you immediately, how about it?"
Foxy didn't attack Rebecca and the others without reason; he mainly noticed that they were carrying weapons, and those weapons were not ordinary, indicating that they were quite capable.
He hasn't been on the Grand Line for long, and the people around him aren't very strong; they can only cooperate with him. The Foxy Pirates are all supported by him alone, so when he saw Rebecca and the others, he wanted to recruit them. Even if they were marines, it didn't matter; once you've acted with pirates, there's no going back.
His dream was to build a large pirate crew, which couldn't be achieved through regular recruitment. So he wanted to test his abilities to see how effective it would be, which led to Rebecca and the others being ambushed.
"You're dreaming! If you want me to be a pirate, you should ask him!" Rebecca said, gesturing with her chin towards Foxy's back, her eyes full of mockery.
Foxy instinctively turned around and was startled to see a tall, slender figure appear in the previously empty space. He didn't know when the figure had approached, but he was wearing a standard naval cloak and had strange drum-shaped decorations on his back.
Vic was also surprised to see Foxy. He didn't expect Foxy to be a pirate at this time. Although he looked much older than his age, he should only be in his early twenties.
Upon seeing that the pirate was Foxy, Vic felt relieved that Rebecca and the others had been captured. With the power of the Slow-Slow Fruit, it's normal to suffer losses when careless. Moreover, the power of this Devil Fruit and his Speed-Speed Fruit are relatively opposite, one speeds up and the other slows down. Who knows what will happen when they collide?
Vic was also very curious about this. He had been developing his Speed-Speed Fruit ability for several years, and the speed it could affect was getting greater and greater. He wondered if using the Speed-Speed Fruit's ability to move within the Noro Noro Beam would be affected. This was a very interesting topic.
Even if an unexpected event occurs Speed-Speed Fruit's speed is suppressed by the Noro Noro Beam, his overwhelming Haki can nullify this kind of rule-based ability. In any case, the situation where Rebecca and the others were directly defeated will not happen. This is the source of his confidence, so Vic really wants to experience the Noro Noro Beam.
The abilities of the rule-based types are all abnormally powerful. Without Haki, they are almost impossible to defeat, and even then, they cannot be broken if the Haki is not strong enough. To defeat them, you must find their weaknesses or make the ability user unconscious.
Once you've been affected, you can only place your hopes on others, like Sugar, a Devil Fruit user. Luffy and Law have both been affected. If it weren't for Usopp, how many strong individuals would have spent their lives doing hard labor as toys!
However, Armament Haki is not an absolute counter to Devil Fruit User. Logia can be captured by Armament Haki and their bodies can be transformed into elements, but their abilities cannot be rendered ineffective. Armament Haki has no special effect on Zoan abilities; it's no different from fighting ordinary people. But if Armament Haki is overwhelmingly powerful, then all other abilities become irrelevant.
"Where did you come from, kid? Trying to scare me to death and inherit my pirate crew, huh? Do you have a problem with me wanting these guys to join my pirate crew?"
Fox doesn't even know what Haki is yet. He hasn't met his match yet. So what if he's a Marine? They're just standing there, letting Foxy do whatever he wants.
Foxy was just being naive and fearless. Most pirates in the first half of the series are overconfident and haven't experienced a real beating. The Straw Hat Pirates was no exception, which is why they suffered a crushing defeat at Sabaody and almost got wiped out.
"These four guys are so weak they're practically useless. Having them as your underlings is pointless. I think it's better to let them continue being marines. Let them follow me! I don't care about strength anymore; they're definitely not as strong as me."
Vic glanced at the four bound men and quipped, not believing that Rebecca was truly helpless against Foxy. The Noro Noro Beam only lasted for thirty seconds; after that, a sneak attack with flying swords would be perfectly feasible.
If Wendy and the other two were exposed to the Noro Noro Beam, they would have no way to resist it, and it would be understandable if they were caught. However, it is very suspicious that Rebecca was caught. It is highly likely that he deliberately caused trouble by refusing to let Rebecca go shopping, just to trick him into coming out.
Rebecca didn't dare look at Vic; her eyes darted around, staring at the sky as if to say, "The clouds in the sky are so beautiful." She was indeed feeling guilty; otherwise, the sword case wouldn't have been just for show.
Barnett and Frodeku felt somewhat ashamed. Frodeku, despite possessing Observation Haki allowed him to Future Sight, failed to prepare for such a sudden situation, a result of his carelessness.
Barnett blamed himself for not being vigilant enough about his surroundings, which had put everyone in danger. Fortunately, the foreman only wanted to recruit underlings and didn't actually kill anyone; otherwise, it would have been too late when Vic arrived. This was a lesson he would remember.
"I don't care what you think, I care what I think. I also believe in them; they'll definitely become outstanding pirates. If you don't want to be captured, you'd better leave now. I don't really want to fight someone like you!"
Although Foxy is not afraid of the Navy, Vic is clearly not an ordinary Navy officer. His sudden appearance is very strange. There are quite a few Devil Fruit users in the Navy as well. It is best not to make a move if possible.
"Really? Then let's see. Whoever wins in the end, they'll stick with them."
Vic said calmly, and as he spoke, he took a step toward Foxy, completely ignoring the worried looks from Barnett and Wendy. However, seeing the confident Vic, they didn't say anything to remind Vic. Frodeku, on the other hand, didn't show such a look, probably because he had seen something with his Observation Haki Future Sight.
Seeing Vic approaching him fearlessly, Foxy no longer hesitated. He pinched his middle and ring fingers together with his right thumb, pointing them at Vic, and then emitted rings of pale pink light from between his index and little fingers, shooting towards Vic. The light waves grew larger and larger as they traveled, until they enveloped and passed through Vic's body.
"Fufufufufu! You're doomed after being hit by my Noro Noro Beam! Go tie him up right now!"
Foxy was quite pleased with himself. He hadn't expected that this navy man wouldn't even try to dodge him; he was no different from a rookie who had just set sail.