Price of Friendship is a single player Trophy featured in Tom Clancy's Splinter Cell: Chaos Theory HD. It is unlocked when the player kills Douglas Shetland using their knife, after having holstered their weapon in the Bathhouse mission.
When the player gets to the top of the Bathhouse, a scene will show Fisher and Shetland holding their sidearm at each other. The player will then get the choice to fire their pistol or holster their weapon. Holstering their weapon will cause Shetland to pull up his pistol to shoot Fisher, but Fisher will dodge Shetland and knife him in the chest - pushing him through a paper window from a tall height.