You don't know if she drunkenly consented or not because of the fact that she may or may not even remember herself.
I said she was undoubtedly too drunk for him to have sex with and it should not have happened. I've been in a very similar situation with a friend before. We were making out at the bar and we went back to her house. She climbed on top of me and tried to have sex with me in her living room. I said no let's go to your room in case anyone comes home. I laid her on the bed and we started making out and undressing. We started making out again, but she ended up passing out because she was too drunk. I tucked her in to bed, went and got her dog and put her dog on the bed with her because they always sleep together, and I then walked away. Called her friends to make sure they came and checked on her.
How easily could I have been blamed for doing something wrong here even though I didn't? I was lucky in the fact that my friend remembered what happened, apologized to me for what happened and we remain friends to this day.
If the situation was altered and she never passed out, we had sex, but she blacked out and didn't remember what really happened then what? I'm a rapist because of drunken memory loss? No. If that's the case, then I've been raped by a woman before.