Yossarian did have brains enough and was, and the only thing that stopped him from abandoning his post under fire and scurrying back through the crawlway like a yellow-bellied rat was his unwillingness to entrust the evasive action out of the target area to anybody else. There was nobody else in the world he would honor with so great a responsibility. There was nobody else he knew who was as big a coward. Yossarian was the best man in the group at evasive action, but had no idea why.