A backfire is just like any other song effect -- it happens any time Doug hears the song. "Backfire" is a bit of a misnomer -- it implies a one-time bad result; it's really more like an extremely unpleasant useless result. (Although "useless" is of course relative; I can think of one in-game situation where Doug made creative use of a backfire.)
As a general rule, Doug does not repeat a backfire experience if he can at all help it. To minimize mistakes, he tends to erase those songs from his helmet.
Yes, that means every "backfire" gate song he hit during the early part of the story is now permanently useless for other gating purposes.
-- Bob
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And all the girlies say I'm pretty dry for a wet guy...
As a general rule, Doug does not repeat a backfire experience if he can at all help it. To minimize mistakes, he tends to erase those songs from his helmet.
Yes, that means every "backfire" gate song he hit during the early part of the story is now permanently useless for other gating purposes.
-- Bob
---------
And all the girlies say I'm pretty dry for a wet guy...