Bites off his dick and shoots the other woman with the gun then we take all out ladies back to the mansion that's how it should play it but no doubt there will be another twist in the tale
why kill possible additions to your Harem?
Donna was ordered to NOT use her gun until ordered otherwise... if Rachel can actually disable mindlos in anyway she would be forced to resort to hand to hand combat... versus a gun.
And she is not devoted to mindlos, so risking her life without direct order seems unlikely.
I suspect the player wouldn't be interested in getting Mindlos killed... yet, as many questions only he can answer would be lost.
Getting him in the cellar in the Mansion and interriogate him with Victoria and maybe Clara, liberated Donna or Rachel seem more productive and something this Harem would attempt.
Also gives Mindlos a chance to escape as I doubt this will already be end of this story... except that there is a bigger enemy lyieng in wait for Mindlos fall.