Otto---Why do you leap to the idea that RG had to attack MK at the door? It is very reasonable to picture him knocking, and she opening the door, recognizing him as part of the downstairs association, and as they were all gone for the weekend, thinking it was Ok for him to use the restroom briefly. She may have then been surprised when he would not leave, and things escalated from there. I read of a case where a very studious girl opened the door to her neighbor, whom she had only known for a day or 2, as she had just moved in. He raped and killed her.
That's why, if someone knocks on my door, I make them step off my covered porch and talk to me while I look down at them from the upstairs window.
I remember once, I was expecting my boyfriend. So the bell rang. I whipped open the door. Two guys were there, trying to sell me something. They were RIGHT up on the door. One more step, and they'd be inside. I interrupted them and told them to step back. One of the guys immediately stepped all the way back to where one more step and he was going back down my steps. The other guy got an attitude and asked me why he had to do that. I told him, if you don't step back right now, i'm closing this door. His friend urged him to just do it, but the other guy kept the attitude. His friend was tugging him back off the porch as I was locking the door. I was lucky that it was nothing, and my BF arrived a short time later.
Once, I had some new neighbors. He asked to use my cell phone and hadn't lived there very long. He wanted to call a cab. It was daytime, still but late, like 7pm or 8pm (same time RG could have been around the cottage) I just took the number and went inside and called for him. I locked my door behind me.
Do you know later, the cab driver was calling me, because this guy had him do it? Then the guy started knocking on my door at least 2 times a week at night. Then, he did it once and it was late. I can't remember what time, but after 11pm. I opened the window and told him to get away from my house. He was drunk and I was scared.
Next door is a rental and he wasn't there long. I was glad.
My point is that sometimes, you open the door or you are already outside your house when strangers encounter you or neighbors you barely know approach you. Sometimes, you feel obligated out of neighborliness or whatever to appease this person.
I'm not strongly tied to the idea this happened with MK and RG, but it's possible.
It's also possible that RG lied to MK and said he was there to meet AK. He had expressed an interest in her and MK wouldn't think it was out of the ordinary for AK to have strange men around, even while daing Rs.
RG could have followed her home on her walk and barrled in after her. He could have chased her to her room. Nothing to knock over until she reaches her door. Just guesses.