A. Trumper is an officious psychopath!
Always impressed by the character design of Aardman's villains and this guy was a freak! Small man in a small job with echoes of frustrated Travis Bickle. So they're on the farm, right - there's no grounds to even impound anyone - and he's trying to kill them! Let's give him the benefit of the doubt and say he didn't know there was a grown man inside… (Man, this film's even scarier for adults!)
"You think I'm ƒucking stupid?"
"What?"
"I know it was you."