The accuser’s friend (that called the police) says the victim remembers the accused’s roommate walking in and telling him to stop.
At least that’s how I understand the murky writing. That means there is a 3rd person with knowledge of what happened.
The writing is terrible, and I couldn’t tell much from what they did mention, but I’d like to know what the third party claims to have seen and done before giving the rape claim any credibility. Either this report is so heavily edited that there is nothing convincing left, or there was never anything there, and I can’t tell which without better information.