What was this. Bruce had no time to cycle through his magical care guide so instead he acted on instinct. Floating cloaks? Dementors, had to be and there was no time time to think on why they might be in the castle.
"Expecto Patronum!" The glittering bull came charging out and ran toward the hooded figures and behind him Bruce. The creatures scattered back into their rooms. Bruce went over to Tony with a confused look, dementors were OWL level stuff granted upon closer inspections they seemed to be lethifolds but still.
"Are you okay?" He asked checking him over. "Stark answer me."