I could just be indecisive and shoot myself.

[It's spoken with a dry tone, but he doesn't sound particularly serious. Now that he has a confirmation of more options, he's got a better solution.]

I say shoot to intentionally miss, then. If I hit 1/3 of the time, then by missing in the first round and surviving the second by you choosing to shoot Luke, then my odds go up to 50-50 for the third. Better odds than what I started with, anyway.