What does Jason know he must do at the river and how does King help him?

Hawthorn knows that he will have to carry the outfit and the canoe to the next passable spot in the river. Hawthorn devises a plan, but it would require the help of King, who is supposedly averse to pulling anything heavy. Hawthorn asks King if he will pull for him. In response, King licks Hawthorn's face and jumps around, much to the crowd's delight. However, when it comes time to go, King pulls more than Hawthorn ever expected.