He nods. "Just to be sure." He still has a lot of nagging doubts left behind by the silver kryptonite, and it's hard for him to tell if it's just a natural reaction to what he just went through or leftover paranoia, and he wants to make sure that he's still invulnerable and that Brainiac didn't somehow damage that part of him when he was infected.

He unwraps the needle and unhesitatingly jabs it into the palm of his hand. Fortunately, the needle breaks instantly, snapping into three pieces as it fractures against his flesh. He wiggles his fingers as if testing them. "Good."