Grinning slightly, Andy couldn't help but to laugh along with her. "What if I promise to keep it our little secret? D'you think maybe you could spare my pathetic life, in that case?" he asked with a smirk. Andy was pretty good at keeping secrets, actually. He'd been really tempted to tell Dean just exactly why he'd be sorry if he tried to fuck with Andy over Luna when he didn't even know what the hell he was talking about, but he'd kept it to himself. He also hadn't told anyone about what Luna knew about Merope and had no intention of doing so, either. Never mind the fact that he spent the last year, give or take, keeping his ability a secret from anyone he cared about. He was far more keen to keep from letting that cat out of the bag again after seeing how Tracy had reacted to it.
The grin fell away entirely when Lexie said he didn't need to compare with the Winchesters. Whether she thought so or not didn't really matter. Andy thought so. He had something to prove; to them, to Luna...and to himself. There was little to nothing Lexie would be able to do to dissuade him, but he didn't say as much. "Oh, I'm sure she was freaked out by the situation, but that doesn't make me feel much better about it, you know?" he asked. "But like I said, I'm not gonna leave her hanging; if something happened to her because I was in a shitty mood, I couldn't live with that. I'll figure something out."
Lexie's suggestion that he get up and move around a bit was music to his ears, though, and he smiled again, however weakly, as he took the crutches in hand and very carefully - wincing with the pain and stiffness of having sat in the same place for the equivalent of a day - got to his feet. Fitting them beneath his arms, Andy leaned his weight down on them and looked back at Lexie. "Should I be lifting my leg up the way I had been or just using the crutches to support my weight and walk like normal?" he asked.