I'm currently stating up an NPC/enemy for the PCs in my game. This NPC has a hawk animal companion (I could picture him with a bird of prey on his shoulder, but not with a wolf by his side or anything). I'd like this hawk to be an actually help in combat, more than just doing flyby attack for 1d4 damage or giving a +2 flanking bonus. I thought it would be cool if the hawk could try and snatch stuff out of people's hands (like small weapons), or maybe fly by and trip/distract the PCs. Would something like this be reasonable? What would the mechanics be?