A year or two ago, a woman was stuck at the top of an escalator leading up from the platform to the fare-gate level. The escalator was (fortunately) stopped, but her pant leg was caught in the teeth, so she couldn't go anywhere. A T worker had radioed or gone for help, but she didn't know how long that would take.

I offered to just yank on the pant leg and pull it out of the escalator, warning her that it would probably rip to shreds. She said yes, and I did, and she went on her way.