He didn’t shoot at the guy...he shot at the floor.
“Once they returned to their room, Mr. Miller approached their bedroom and began pounding on the door shouting, ‘I’ll kill you,’ after the door was shut and locked on him,” the release states. “That is when Mr. Miller shot his handgun 3-4 times into the floor outside the bedroom door in a rage.”
He did shoot through the door at both roommates.