It's not weird: although the woman was literally falling down drunk, falling over in a kebab shop and leaving her handbag there before staggering off with a pizza, was described as extremely drunk by every witness who did not want to put their penis in her, and was so out of it that she didn't wake up when she pissed herself at some point in the night, the jury felt that McDonald could have had a reasonable belief in her consent having talked to her, gone to the hotel with her, is witnessed communicating with her there etc.
Evans on the other hand, turned up in the room (having lied to get the key) uninvited, unexpected, and unwanted. His brother and a mate who travelled with him are already outside the window, trying to film what happened inside without the consent of either McDonald or the woman. (I would love to know how they got there so quickly without Evans telling them where to go.) A combination of the interruption and hearing the giggling outside the window means McDonald stops having sex with her, and closes the curtains.
Before McDonald leaves, Evans starts to have sex with her. Evans insists that someone asked her first, but can't say who: both of the men in the room give evidence on oath that they didn't. Neither of the friends outside are called to give evidence that they heard it, or the "numerous" calls for more vigorous sex that he says she made. Similarly the hotel's night porter, who McDonald had asked on his way out to check on the woman as she was sick, could hear sex was happening in the room, but no "calling out" "**** me harder" etc.
When Evans stops having sex with her - he says because he was worried his girlfriend would ring, but it's possible he discovered that sex with semi-comatose women is really boring - he leaves via a fire escape.
So the question is where's his reasonable belief in consent? The only interaction they'd had outside the room turned out to be when he stepped over her slumped on the floor drunk. Neither McDonald or the woman wanted him in the room. The only conclusion from the mens' evidence is that, in fact, no-one asked her if she wanted to have sex with him and, given than none of the three people able to hear what happened in the room could hear the cries, that they didn't happen either.
He's been sent for retrial, and the reasons for overturning the first one are secret until that's over. I'd love to know what they are, but I still think he will be lucky to avoid a second conviction.