I don't think he is afraid of him. However, Lewis is bright enough to realise that it is much better to have Bear onside than working against you. Lewis has a short fuse and if he had been provoked by Bear in the same way others have been, he would not be a happy bunny in that house. I am sure that Lewis has found Bear's antics, especially concerning food wastage, as irritating as the others, but proclaiming loyalty protects against attack.