The problem is that there's nothing else needed. Opening your door to someone who even is presenting ordinary force can make you the aggressor in a lot of cases, especially of the prosecutor wants to add the scalp of a racist to his trophies.

Those women didn't present an imminent threat of ordinary force to his person so long as that door was closed. There's no good way to get around that. Even if they were outside his house screaming "come out here bitch, I'll fight you!" that would still be the case. He increased his own threat against him by opening the door.

Never pursue, it reverses victim and offender.