From WENN.com

Hemsworth nursed a black eye and a painful nose after he was accidentally knocked out by Stewart while filming a fight scene for the film last year (11).

However, the movie tough-guy insists his dented ego was more hurtful than his injuries.

He tells Collider, ""There were a few bumps and bruises, one included Kristen punching me in the head... Nothing too serious - my pride more than anything.""