Umpqua Community College student concealed carrier Christopher Harper Mercer (MSNBC 01 Oct 2016):

“Luckily we made the choice not to get involved,” he explained. “We were quite a distance away from the building where this was happening. And we could have opened ourselves up to be potential targets ourselves, and not knowing where SWAT was, their response time, they wouldn’t know who we were. And if we had our guns ready to shoot, they could think that we were bad guys."