He saw Thor sit up.

At that distance he was going to shoot if the bear made for the break.
For thirty seconds Thor sat on his haunches.

Then he started for the ravine, ambling slowly and deliberately.

Langdon, panting and inwardly cursing at his ill luck, struggled to make the last ten feet to the edge of the slope.

He heard Bruce yell, but he could not make out the warning.
Hands and feet he dug fiercely into shale and rock as he fought to make those last three or four yards as quickly as possible.
He was almost to the top when he paused for a moment and turned his eyes upward.