Dan still had very little strength in most of his left hand, his grip minimal at best - the broken bones were at the base of three of his four fingers, and moving them made his wrist ache. He really only had his thumb and index finger to work with and that wasn't nearly enough to hold most things in a decent grip at all. So he had to set his coffee back down on the table before he could take the gun from Shep.
Careful to keep his hand away from anything that looked even vaguely trigger-like, he tilted it this way and that to look at the gun. The laser gun, holy shit. He handed it back after that, aware that he was having completely the wrong reaction to a very deadly weapon. It was not a toy. "That is also very cool, and I wouldn't mind practicing with it at some point, if that's still okay with you," he told her, in case she got the wrong idea.
Nodding at her thoughts on the doors, he pushed his hair back from his face as he glanced back over at his dad. The two most head-melting doors he'd gone through had resulted in his parents still being alive in at least one time-line, and him as an adult getting to spend time with them both... and him getting an absolute pummeling, mentally and physically, both times. Not that he'd let on to Jack about any of it beyond the obvious.