In Fenix's case I believe fenix is their own client, so I'm certain the client wont complain
Are the other hairs sliding out with no resistance? If it's one hair I wouldn't worry about it, one either the hair didn't die ( and will grow out of the follicle in a day or so or alternatively it will shed on its own like a tombstone does if the follicle has been killed. As long as its only one or two hairs, we dont worry about it and we'll get em next time. If you aren't getting smooth extractions from several hairs, its time to re-evaluate your technique and energy levels.