They didn’t even have a look at the code. Their task would have been to write and maintain end-user documentation and they left before they even had computer and stuff set up. Just never came back from lunch. Said they’d not feel up to the task. I was just a student at that time, so I can’t really say if that was a hiring fuckup or just an odd person. Certainly one of the weirder things to witness in my career.
Most likely explanation is that this person received a better job offer and did not wanted to let your company know.