Yeah if you look at the old 3rd ed rulebook it has a diagram on the old style plasma guns the metal cadians and the like would have, aka the really round tipped ones. Those holes you see at the muzzle of the plasma gun are the vents and apparently, they can vent backwards if they build up too much heat. In addition, those coils on top heat up as well, hence why people paint them that blue/white color. Obviously anything that hot wouldn't be something you want to put your face near.
I could easily see some of the get's hot deaths being something as simple as the gun kicked back a bit more than the wielder intended and smacking into their face.
But I'm dragging us into lore, the plasma gun has some pretty wonky and conflicting stuff written about it, even by 40k terms.
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