We, the Children

When Lambo's new dimension-jumping bazooka—a product of Byakuran's experimentations—goes off by accident, Mukuro decides to act nice (for once) and push Tsuna out of the line of fire. It is, quite frankly, one of the worst decisions he's ever made. (In which Mukuro plays the villain again, only to find it's much harder than he remembers it to be.) (TYL!69, TYL!100, GEN)