The perp stopped cooperating when he got up to leave.
I’m not saying the homeowner isn’t in a world of hurt - he likely is, this not being Texas.
But the perp did stop cooperating. And the homeowner had no idea what he might do next.
That’s not what the story says. According the story the perp got on the ground as order then the home owner shot him. Unless you’ve got some other source of data on this to link to the story as currently available has the perp cooperating up through getting shot in the ankle.