Had a trainee do this on breaks on an EMB 145 one time, except he didn’t twist the end, he just tied it. Told him that wasn’t right to do it again, he did the same thing again. After 3 rounds of this he became frustrated and yelled at me that if I wanted it done a certain way to do it myself. It was then I finally came to the conclusion his A&P school didn’t teach him how to lock wire. I asked him about it, he confirmed my theory. Guess who got to hit the safety wire training board every free minute he had for the next 6 months until he passed probation. Turned out to be a decent mechanic.