“Whether they honestly think she consented or not, I’ve never met a young woman before who left a consensual sexual experience in tears and bleeding, and for that alone,” Ms. O’Neill said, “I don’t think they should be allowed to put on the green jersey again.”

The Ulster case began when a 19-year-old woman said she was raped in June 2016 at a party at Mr. Jackson’s home. In a text to a friend a day after the house party, she appeared intimidated by the prospect of facing down the men she had accused: “I’m not going to the police. I’m not going up against Ulster Rugby. Yea, because that’ll work.”

Mr. Jackson and Mr. Olding were charged with rape and sexual assault. The trial centered on whether the woman had consented to the acts performed on her, and on the sometimes contradictory accounts of what had been done, and by whom, on a night fueled by alcohol.

Mr. Olding said he had had consensual oral sex with the woman, but both men denied having had vaginal sex with her. A taxi driver who took her home testified that she had been “sobbing throughout the journey” and that he saw blood on the back of her white jeans. A doctor told the court that he had observed a laceration in her bleeding vagina. But defense experts argued that this was not proof of rape or even that she had had sex.

The young woman spent eight days on the witness stand being questioned by each of the defendants’ lawyers. She sat in court while her underwear was passed around for the jury to examine. Defense lawyers cited testimony that said the young woman did not physically resist or scream for help from other women downstairs.