Loud pop when scraping

i know fab debris normally sounds like a “tic tic tic” kinda thing. But some windows ive come across seem really smooth no sounds at all then i get this big POP out of no where. Is that a big piece of fab debris coming loose?

I’ve had the same thing happen and when I looked closely it appeared to be larger than normal fab debris pieces. Other panes on the same house had similar problems. I brought it to the clients attention and they said to continue. I of course had the waiver already in place. They needed the windows done that day for closing.

Thats good quality glass you kidding? NOT!! I had that happen to me a couple times,for the most part i notice fused glass fines usually in the sealed IG unit.