There were a couple of Hybrids who saw the entire thing, and they quietly scooted off as harmlessly as they could just so they wouldn't incur Ayaka's wrath upon themselves. They knew that once the Blood Art got the better of someone, they had the tendency to go wild and hurt everyone around them.
Upon seeing what happened to Ayaka, Kazuichi wasn't surprised at all. Although it took him a couple of hours and even then he could barely control the Blood Art. He was a genius, or so that's what he thought, but he didn't expect Ayaka to be worse off than him.
She just used her Blood Art for a couple of minutes and now she had become feral. One mistake and it could literally cost her her title as a Hybrid. After all, it only takes one bite to the uninfected for someone to go mindless... and in the middle of everything, there were Shig and Tris who were totally uninfected.