Maybe. On the one hand, Grif doesn't especially want any of them to die and he does value the other members of the team even if he's a jackass about it. On the other, a lot of this scares him very much. Grif's not a brave person, he's just an impulsive one and it might get mistaken for bravery. The less time he has to think about it, the more likely he is to end up doing the dangerous thing because he has less time to psyche himself out.

He also might do the nope, nope, fuck that I'm out thing if it were bad enough, and then just be unable to stand the guilt and change his mind at the last second. But like hell if he's going to let anybody know.