This happens to me all the time, however when I pull to see if it is still attached to my scalp I do it very lightly, so there is no chance of it being torn off. As its not done on purpose, to purposely remove Kes, I dont think it is a Bujjer Kureit.
However you should still Pesh infront of the 5 Pyare, and let them know and they can decide what to do.