I disagree that supervision makes feeding life okay. I fed my Ball Python live when I first got him, and I could see the mice squirming inside of his throat. There's nothing you can do to help if the rodent causes internal damage.
Using tongs to move the mouse around is the equivalent of giving him a live mouse. As long as you're heating the mouse enough, and you're moving the mouse around, you shouldn't have an issue. Some snakes are really stubborn about eating F/T, but eventually they will eat it.
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