It's a little ambiguous here:
The girl explained that she’d been drinking a lot, and felt ill, so she rested on one of the beds. Baldwin approached her and began fondling her breasts, then put his hand under her underwear, fondling her clitoris. This wasn’t consensual, she told them. She was passing out during the act. He gave up trying when the rest of the group re-entered the room, perhaps, she said, out of frustration.
Did he stop when he heard the others coming into the room so no one saw what happened? This is the part of the story that's not clear. Not sticking up for the guy if he knew its a scumbag thing to do.