JJ knows Clyde is having him watched, obviously by that laser beam pointed directly at him when he did confront Clyde, and he also now knows Clyde is no idle threat, and that if JJ spouts off about Clyde in any way, shape or form, his mother and sister will both wind up dead. This poor kid is between a rock and a hard place, so although he’s determined to take Clyde down and out, he knows that any attempt to bring in the police will seriously jeopardize the lives of his mom and sis.