Ouch!! Not nice at all. I'll crap myself if the ICE2 in my Trex 700 does that. I've now fitted a cooling fan to it, just in case.
Look what happened to my E-Flite 80A ESC in my Pilatus PC 21 last weekend. ESC and OS motor is toast! I am thankful that I did not use the bec in the ESC. Would have lost the plane too if I had. The motor made a screeching sound about halfway into my flight and 2 seconds later I just saw a trail of white smoke. ( It looked cool! )Luckily I managed to land the plane okay.
Now I wonder. Did the motor cause the ESC to go or did the ESC cause the motor to go. The ESC is, well, look at the photos.

The motor has lots of molten copper wires inside. Sorry, no pic of the motor. Just about every single wire became unsoldered!

