Agreed. Had the perp not been attempting to leave the scene, but continuing to bang on the door, it would be different ball of wax.
How does one tell if someone is “leaving the scene”, vs regrouping/calling re-enforcements or going to get a gun?
Is there anything the homeowner is permitted to do to keep a criminal at the scene (without firing) or does the homeowner just have to let them flee?
Has it been shown that robbery (and not rape) was his motive?