Su Ming had Adjutant notify both Hydra and The Hand, but after receiving Adjutant's mass-sent "helpful tip" text, the other group not only failed to pursue them, but instead quickly withdrew with the cash boxes The Hand had paid during the transaction.
As expected of Hydra. They were cautious enough in their dealings, clearly having suffered no small amount at the hands of the Avengers.
The Hand's strongest presence in the United States was around San Francisco. There were too many superheroes in New York, as well as The Chaste, based in Chinatown, opposing them. These ninjas could basically be said to be isolated and without support.
Ninjutsu in the Marvel Universe was an extremely broad concept. Part of it came from Xu Fu of the Qin Dynasty fleeing with portions of the Qi Cultivation Method and creating knockoff techniques on the Japanese Islands.
Skills activated with knockoff "qi" could be called ninjutsu. For instance, using qi to walk silently across rooftops was called "Ninjutsu: Skanda's Foot" in Japan, while in China it was simply called gathering qi to sneak across roofs. There was no particularly cool name for it, since any martial artist could do it.
After all, proper martial artists flew through the air. Was it really necessary to name a technique just for using lightness skill to get onto a roof?
But ninjas had to name their techniques, and those names had to be this cool.
Randomly tossing hidden weapons was not called throwing them around like an idiot; it was called "Ninjutsu: Multiple Shadowless Shuriken." New Year's Greeting Swordplay was not called a jumping slash; it was called "Ninjutsu Secret Technique: Eight Gods One-Slash."
Many unnamed qi techniques used in China were learned by ninjas, given lofty-sounding new names, and turned into ninjutsu techniques. Fundamentally, it