I would just say when he arrived to inspect the assailant, the door was kicked in. It’s easy breaching a door and happened fast..maybe a ruse was involved. Just speculating.
I am surprised there were no cameras or security system that took video
“It’s easy breaching a door and happened fast.”
Which means don’t rely on a weak lock for home security. Buy a BIG deadbolt that slides into the door frame or use angle iron bolted into the door frame where you can slip in a two by four or iron bar. Locate the deadbolt 12 inches from the top or bottom of the door because 70 IQ criminals won’t expect that location.
Both contraptions will hold back fat thugs or battering rams that will allow you sufficient time to finish your coffee and then rack a round in the Mossberg.