Read the last paragraph on page 42. What took place behind the belt of river trees? use Textual evidence to support your answer.

Dave was shot behind the belt of river trees. He could no longer follow the team and cried in pain and lonliness.

The Scotch half-breed slowly retraced his steps to the camp they had left. The men ceased talking. A revolver-shot rang out. The man came back hurriedly. The whips snapped, the bells tinkled merrily, the sleds churned along the trail; but Buck knew, and every dog knew, what had taken place behind the belt of river trees.