This big dumb jerk has no idea about magical anything, so seeing anyone that he came in with who was previously void of powers suddenly using them is going to blow his geeky little mind. Jensen is also just your baseline human with no discernable abilities other than an odd streak of luck that's gotten him to not get dead. He's military and has military training, tactical abilities, hand to hand combat proficiency, knife fighting, and is boss with a crossbow -- none of which he has access to other than punching people and he's still a little worn out from his goo vomiting sessions.

That said, it won't stop him from jumping in to help out with anyone looking to escape from the cave or who might look like they're getting overwhelmed/biting off more than they can chew/getting left behind. He does not like leaving people behind. He's anti-leaving people. And there may be people he's become familiar with and is puppy bonding with (don't judge him).

I'm happy to have him team up with people against odds or to help with just getting anyone out. He can be sneaky when he needs to be.