Transcript for Students Ward off Intruder With Gun, Face Expulsion
We turn now to two college students who could get kicked out of school because they pulled out a gun to stop a breakin. They say it saved their lives. The college says it violates policy. Reporter: Gonzaga university students were home in their apartment thursday night when there was a knock on the door that would put in motion a whole series of strange events. I just kind of popped up and opened the door and see mr. Taylor standing there. He explains he's homeless and that he needs money. Reporter: The man was jon taylor, a repeat offender, who said he had just gotten out of jail. Fagan says taylor tried to barge in. I pointed my weapon at him. He sees me and takes off. Reporter: Then the pair called police. Taylor was soon arrested. No one was hurt. The boys were safe. IN FACT, McINTOSH HAS A Concealed weapons permit for his gun, which he didn't fire. No problem, right? Not so fast. The college seniors got another knock at the door. This time from campus police. Confiscating the weapon and telling them they had violated school policy and could be suspended or even expelled. The university policy prohibits the possession of weapons in residential facilities. We have a similar prohibition on the rest of campus. Reporter: Late sunday, the two were told they would be put on indefinite probation, which they plan to appeal. We were defending ourselves. There's no reason we should be punished for it. Reporter: They say they didn't know anything about the policy. But they wouldn't change a thing any way. For "good morning america," neal karlinsky, abc news, seattle.
This transcript has been automatically generated and may not be 100% accurate.