My biggest problem with it is that she leaves the relative safety of the doorway on the left side of the screen, and seems oblivious to the guy that took a right turn. If he was crazy enough to do it, he could have come back and blind-sided her (and not in the good sense, where she puts him in her Christmas card photo, and he goes to Ole Miss).
As for any shots fired out the door, at their back-sides, yeah, that could be a legal problem. Personally, though, I wouldn't vote to convict her for that. She's a small woman, fighting off three men (armed or unarmed) in the middle of the night. I'd give her all manner of lee-way.