Your friend says that some dude punched a girl on the street. (Kiddie kills innocent/defenseless player)
Your friend, being the badass that he is, beats up the dude and steals his watch. It's worth $25. (Key seller steals key from douchebag)
Your friend then says that he has no use for the watch and will sell it to you for $2. (You buy key from seller)
It's a case of Robin hood.