Jack almost flinches when Reaper ghosts right up to his face, putting them mask to mask. Claws twist in the leather of his jacket and his instinct is to jerk away--which he does, until he realizes that he's not scared.

Good, he thinks, watching the crack in Reaper's shield. Anything he can do to get under his skin, when he's so powerless otherwise. Even if the Legion didn't have rules about killing (not that he cares about getting thrown out or imprisoned if it means Gabriel is dead), he doesn't think Reaper can die conventionally. The situation is impossible for both of them. Might as well remind him of that.

"Do your worst. I'll make your life hell."

He already has, in many ways.