Su Yunqing naturally knew about Fire Style: Majestic Destroyer Flame.
Back when she watched Naruto, when Madara Uchiha used a single Fire Style: Majestic Destroyer Flame and forced more than twenty Shinobi Allied Forces ninja to use Water Formation Wall simultaneously just to withstand it, she had been beyond excited.
Although Madara Uchiha had been a villain at the time, and getting excited over a villain was a little inappropriate, who cared about heroes and villains back then?
Sometimes, villains possessed a charm that heroes simply did not.
Like Madara Uchiha, and Aizen.
Besides, they were both redeemed later on, so they could not really be considered villains in the strict sense.
Back then, she had genuinely thought Fire Style: Majestic Destroyer Flame was an S-rank Ninjutsu. Only later, after someone explained it, did she learn that it was actually B-rank. She had not believed it at all then.
How could a B-rank Ninjutsu possibly possess such immense power? Its visual impact might not have matched Sasuke Uchiha's Lightning Style: Kirin, but it was not far off.
Lightning Style: Kirin was known as the strongest Lightning Release Ninjutsu.
Yet Fire Style: Majestic Destroyer Flame was only B-rank?
All she could say was that not every Uchiha Clan ninja was Madara Uchiha. Even a B-rank Fire Release could produce such an outrageous effect in his hands.
Of course, that was also because of Madara Uchiha's Dojutsu enhancement.
Although Naruto had never explicitly described Madara Uchiha's Mangekyou Dojutsu, it had been analyzed inside and out.
One point that had gained widespread recognition was that Madara Uchiha possessed a Dojutsu capable of amplifying Ninjutsu. Perhaps it did not only amplify Ninjutsu; it might even amplify Susanoo.
Otherwise, there was no way to explain how Madara Uchiha, in his Eternal Mangekyou state, could fight