I think the thing I'm most confused by is how Max and Suzy are both able to stop Iris/get Velvet out, when she took the lunge before Miyuki even left.
EDIT: I'm just going to wait for everyone to weigh in on it so we can get it consistent. Velvet probably gets at least a bit injured.
Iris had lunged but it was indicated that she hadn't actually struck yet.
Before one could blink, Iris was upon the vampire, her claws primed to swipe and mouth open in a wild smile.
Max was already in the hallways so it can be presumed that he was mid-scene and could stop the lunge. Suzy can float through things so you can theorize she'd be able to travel/get to the scene pretty fast, but she could at least stop Velvet from turning into vampire a la carte since the werewolf was still poised to strike.
Also, I presumed this was all on the same floor as mentioned prior--especially since Yuki "quickly ran" to the lobby desk for help.