The when is not referring to an actual time, it's referring to the action.
If we're going to pick bones, #17's sentence wasn't right and shouldn't really have contained the word 'when'. But, this isn't what we're supposed to be commenting on....
it was probably on the bridge of her nose. I have this tool that I use to help pop pimples and when I use it too hard on the side or bridge of my nose it hurts and I feel like if I'm going to break my nose so I just stop lol