Defensive Trolley: A runaway trolley is lethally heading towards five innocent people. Engineer is about to divert the trolley away from the five towards Workman, who will be killed. Workman can prevent the diversion by throwing a grenade that will destroy the switch, but also kill Engineer. The five will be hit by the trolley. (Frowe 2018: 475, revising a case in Quong 2016: 826)