Episode 15:   Armstrong and Scar fight. During this fight, Armstrong knocks off Scar's sunglasses and sees that Scar is an Ishvarite, a race of people pretty much wiped out by the army during their rebellion. A lot of history is explained, some of which Ed manages to find out from Marco.   Armstrong is thoroughly whupped by Scar, but not killed. Scar runs back into Ed, Al and Marco, and in trying to kill them all, rips up half of Al as well as destroying Ed's automail arm. Ed decides to allow himself to be killed by Scar since Scar will spare Al's life (rightly pissing off Al). Before Scar could kill Ed, Marco whips out his Philosopher's Stone and uses it against Scar in a way that is not explained. Marco just knows that Scar's arm graft is weak against the Stone, due in part to what the markings on Scar's arm mean.   Roy and company show up, and Scar flees. Ed offered to let Marco hide out at his hometown, but when Marco hears it is the home of the Rockbells, he refuses and allows himself to be taken into the custody of the army once more. As Bradley's scretary arrives on the scene to take Marco into custody, Al swears he hears his mother's voice, which Ed dismisses as stress.   In this episode we learn:   -During the war, Mustang was the one who executed Winry's parents, under orders from Gran, for "interefering" in the battles by healing all injured -Ishvarites worship a god whose teachings dictate that alchemy is evil, because is takes the creations of their god and turns them into other items, not of god -The war started when an Ishvarite child was accidentally killed by an army soldier -Marco and Mustang regret their actions during the war, and Mustang allowed Marco to run away (perhaps Roy is not such a slimeball...)