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It can take them a while to recover from a moult and harden up so leave it in peace and I'm sure it will emerge in time, usually around a week. Once its fangs turn black you can try feeding.
It doesn't sound good but I'd leave him be until tomorrow and try again with the brush.
Do you know if he could have fallen and injured himself when he escaped?
It would be better just to dribble water on the substrate near his mouth rather than mist the whole enclosure.
Does he react if you touch him with a soft brush?