One Esc fried but everything is fine

Hi, i was testing my drone in the ‘compass/motor calibration’ when suddenly a motor started sparking a bit in then pink smoke came out from it’s esc. I checked the other ones and everything seems fine including this motor. My question is what could’ve caused the esc the die. I know that my pdb wasn’t isolated from the frame, I directly zip tized it to it so can it possibly be the problem?
I don’t wanna buy I knew esc and kill it.
Any idea? Thank you

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