True: we don't know whether Wint would slit Philip's throat in that situation.
But, as a man, I want to ask you and other women in this forum a question. Would you forgive your husband if he fled out the front door calling 911 in that moment, and then your son had his throat slit in response?
In this scenario, everyone survives but Philip. Wint isn't wearing a mask.
I have to admit that part of my hesitation in that moment isn't just about the son, it's about facing my wife thereafter. So, I want to know what the reaction might be.
In my mind, I'm probably giving Philip 50/50 odds, myself 90% odds, and 80% odds that my wife and the housekeeper survive. If I surrender myself to Wint, I'm giving all of us about 25% odds of survival, if I thinking clearly and Wint isn't wearing a mask. It's an emotionally wretched choice, but it isn't logically tough, in the situation as described, when I can identify Wint.