A fellow MTA employee who knows the 21st Street G train station very well is coming forward to defend the agent who witnessed a rape there and tells the Daily News that agents are "trained not to leave their booths for fear of a ruse, and do not have an outside line to dial 911 underground." David Chance is a 24-year MTA veteran who also worked as a station agent at the same spot where John Koort was working and called station command during the rape of Maria Besedin. Besedin went public to the media after a judge earlier in the week threw out her lawsuit against the MTA, Koort and train conductor Harmodio Cruz for their lack of effort in preventing the rape they witnessed. But Chance says Koort did everything he could, telling the News, "He would have been foolish to go out there. He immediately alerted the emergency system—that's all we are empowered to do. If it was me, unfortunately, I would have done the exact same thing."