Peter is ducking before he's even consciously aware that Murdoc is throwing a punch. It's a glancing blow, and he reels back, looking entirely shocked.

And then suddenly every single unicorn is on the far edge of the meadow, snorting and pawing the ground with nerves. That's when he suddenly looks furious. "What are you on? You don't do that in front of them!"

His wand is out, and he's pretty skilled at nonverbal spells. Full body bind is a simple one to cast.

"I shouldn't have brought you at all."