Meet the P's. They give Impressions to U.

P would perversely like to act like P would keep giving them the electric shocks (but hopefully in real life P would refrain...)

and that other one P is with would have less incentive to feel bad and would almost definitely keep administering the shocks

and that other one P is with would feel some anxiety but keep on going, but would feel worse about succumbing to the peer pressure afterwards.