A soft frown-- but that likely is within his capabilities. He's never studied much beyond the most basic first aid, in the event that he may need it, but a change in wound dressings would be basic enough. Remove the bandages, ensure the wound was clean and healing, replace. Perhaps add in some sort of ointment or what have you.

He has no reason not to help the man-- but, similarly, he has no reason to do it, either. And so there's a short silence of consideration, before he finally nods.

"I believe I could. I assume your wound can't be too devastating, as you're up and about. It's just a matter of finding the supplies to tend to it."

And as apprehensive as he feels about everyone in this place, this man seems to mean no harm. Decide his decidedly more dodgy seeming explanations, there would be no sense in turning away any potential allies. "If we can find some bandages and antiseptic, I could assist in changing the dressings. We can start just by looking for kits, I'm sure they'll have some in this area of the store."

And, hey, it gives him something to do and focus on. He always operates much better with a clear goal, even if it's just something to occupy his time, as opposed to a farther-reaching one. He gestures to the next aisle over, before speaking. "I'll start there, if you want to take the other direction. Let me know if you come across something we could use."