If Jim had still had doubts about the kneazle's intentions, they're banished by that look over the shoulder, a silent 'are you coming or what?' that comes across loud and clear.

Well. If he's heading into unknown dangers, it's a good thing that Crookshanks has a phaser, because Jim doesn't. He pauses only to unholster it from the cat's odd little pack, feeling more reassured about the impromptu mission with a weapon in hand.