Apparently by the mere supposition that he (yes, I said "he") perceives himself (again) as a bringer of joy and colour to an otherwise barren world. It's interesting to see how Valve played on the already-unclear identity of the Pyro. Upon reading some comments on the video, it seems that many people heard the Scout saying "He's not here, is she?", which I did not hear being uttered at all. And of course all the magical wonderland thing with lollipops confuses people further still.
And I think it was irony, Varrok.
In retrospect, the video is better than what I originally thought of it.
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