[His reflexes are good enough to grab hold of and hang onto part of the bridge.]

[What kind of bridge is it? If it's a rope-and-plank bridge and the rope's snapped, he won't have the reflexes to brace himself before smacking into the cliff on whichever side that rope is attached, but he should still be able to hang on; if it's a rickety wooden or metal sort, such that he just fell through a bad part and the rest is standing, he'll try to clamber back up to the remaining part of the bridge.]