Oh no he didn't. Who was Crabbe to try and calm his bluff?
Of course, he was under the spell the spell now. Floating, but he still heard Crabbe's commands. He wasn't floating too much, though; a side effect of Crabbe's split attention? Either way, he'd listen to orders, but he's do it his way.
Ernie clucked, and bucked, and scratched the floor, much like a chicken. And much like a chicken, he went to peck at Crabbe. Of course, Ernie had no beak, so it came out much more like a headbutt.