calluses and that

getting calluses on my fingers from playing is rewarding and i love it, they are harmless youve just got like solid fingers.

BUT one of my pals had a big ass callus on his index finger and he tried to play one of the schools shitty guitars with the rusty strings and all and he CUT INTO HIS FUCKING CALLOUSE !? HUH !?

im still processing it tbh lol i mean i know it can happen but it was like a fucking cut yknow?