Bob and Ray Get into an Argument in a Parking

True/False

Bob and Ray get into an argument in a parking lot over whether or not Ray owes Bob $50.The argument escalates to the point where Ray calls Bob a liar.Bob responds by punching Ray in the face and then walks away.Ray rises from the ground and comes up behind Bob and hits him in the head with a rock,seriously injuring him.About this time,the police arrive at the scene.Ray tells the police officer that he acted in self-defense.Ray's claim of self-defense is valid under Texas law.