A plane crashes and presumably kills everyone onboard except for Chuck (we don't see their deaths, although we later see one body).
As a plane falls to the ocean, a co-pilot gets up and his head gets hit by the roof due to the strong frequent motion of the falling plane. We then see him with blood on his face as he cries in pain.
A huge wave knocks Chuck from his raft and we see his legs bang painfully, and bloodily, on some sharp coral.
Chuck punctures himself in the hand while attempting to build a fire. We see a hole in his hand and blood gushing out.
Chuck knocks his tooth out with the blade of a skating shoe; there's a spurt of blood and he faints from the pain.