Wilbur was going to the place he goes to, to calm down, but the rocks are slippery because of the rain, soon enough he slips and falls into the water, and the stuff he has on him is weighing him down, so now he doesn't know what to do, because the stuff he has on him is special to him. And all he thinks is "Drown with the stuff I find special, or... Lose the things" and because he can just be revived again and he's way to deep to swim back up, there's no point. He falls unconscious