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Shouldn't happen.
You do a bit here and a bit there to never let it go to hot.
People say it only matters when you can't touch it anymore, but I would not stress it.

Oh dear!
Sounds as if you still got both of your eyes, though, so not all is bad.
Wear safety goggles, those chips can fly.
Guess it happens to all of us sooner or later.
When it happens on your...