A dismissive 'huh' didn't solve the mystery here and Iron Man continued to watch the zombie lope away while Spidey rambled, only offering a distracted, "Sort of, sure..." when he asked about Jess. It wasn't quite flying, more like gliding, not any use if Iron Man dropped the cargo and someone needed to scramble a recovery. They really needed to upgrade that suit; they could use another strong flyer if Wanda-- Well. Now Iron Man was really distracted. He shook it off, turning to Spider-Man to try to listen, still holding the doorknob but more for support than to keep it closed.
"We'll have to test it," he finally answered, because he wasn't sure himself. The armor was strong, sure, but that didn't mean Tony wasn't breaking a sweat trying to lift a whole bus and he definitely didn't know what kind of juice that would take. Conveniently, they had a natural testing option; "I have to get the thing back to the museum anyway, we'll find out--" A shotgun blast rattled the windows of the bus depot waiting room, making Tony instinctively jump away from it and raise his glowing palms at the glass. The trapped zombie was gone, nowhere in Tony's line of sight as he searched the room through his spread fingers.