There is supposed to be a right way to do get through there, but the only way my party could succeed and keep everyone alive was to carry a crate from one of the earlier rooms, save the game, then Shift/Forward arrow key down the hall, pressing the Zero key on the numpad at the right time to jump over the two fire pits and jam the crate under the porticullus. Press the Fight icon on your carrier's action menu to drop crate in place, then duck under the gate.
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