Not sure which pathway you're going down, but here's the way I always do it:
Carry a crate in front of you, and run through the fires. If you time it just right, the gate will come down, hit the crate, and bounce back up. Keep running through and you'll be on the other side.
This isn't foolproof, so save before you do it, but I can generally get through on my second or third attempt, if not the first.
-Sazerac
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