How do they manage not to melt the chocolate however?
The same way they don't melt deep fried ice cream. It does it so fast it doesn't have a chance, just enough for the batter to get done. You can do the same for your hand. Coat your hand in batter and stick it in their for a few seconds and you will not burn your hand. PLEASE DON'T TRY THIS AT HOME KIDS ... YOU ARE BOUND TO DO IT WRONG AND BURN YOURSELF.
"IF I COME ... I'M BRINGING THE PAIN WITH ME"