Someone once described the secret to making magic as putting in far more effort than any reasonable person would, such that no reasonable person would think you'd done it the hard way.
Lawrence puts out a match with his fingers as a showy trick. Someone else tries it, and cries out that it hurts, then asks what the trick is. He replies, "the _trick_, William Potter, is not _minding_ that it hurts."
I would not rule out that he wetted his fingers before doing this trick, and, possibly, timed things correctly to rapidly transfer some water to the wick before his fingers got too hot.
(https://en.wikipedia.org/wiki/Leidenfrost_effect may be relevant)
:)
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