Sword Art Online (2012)

S2E11 What It Means To Be Strong

Following their narrow escape from Death Gun, Kirito and Sinon seek refuge in a secluded cave in the desert. As they take a moment to catch their breath, Kirito begins to ponder the methods Death Gun may have used to eliminate his victims. During this contemplation, he stumbles upon a chilling and unsettling theory that leaves him deeply troubled.