Ritchson has revealed the Brit was involved in a nasty accident during practice for a stunt scene on The Hunger Games: Catching Fire, and hurt his hand while grappling with a stunt performer.
The star tells E! Online, "Sam got hurt the worst. He broke his hand doing a stunt... He broke it on the stunt guy, warming up. I was standing right next to him. It was tough to watch... (He) took it like a champ - he took it and kept moving."
The Hunger Games: Catching Fire, the second big screen adaptation of Suzanne Collins' popular book series, is due to hit cinemas in November (13).