A female resident called 911 as Donofrio kicked the door, while a male resident went to retrieve a firearm elsewhere in the home
They literally did that.
Donofrio broke a glass window on the front door “and reached inside to manipulate the doorknob,” at which point the male resident fired the shot through the broken window
Breaking a window and then attempting to open the door is enough to justify killing in self defense under local laws, even if the intruder has not entered the building yet.
The article is specifically written to have a headline that implies someone got away with murder, to get traffic. The point of articles like this is to profit, not to inform.
Man shot while breaking and entering, is a much less profitable headline.