Once the area is clear, gather up all the dropped gems and supplies and go back for the MAX HEALTH UPGRADE. In the single-player game, hop over to the ledge to the left of the drawbridge and pull the golden handle to temporarily lower the bars near the upgrade. The ice vent to the left stays on, so you'll have to take the long way around, as shown here:
Jump back onto the bridge...
...run/roll along the ledge on the left, and then jump across the gap to snag the upgrade.
In co-op mode, there is no golden handle. Instead one player needs to stand on the middle pressure pad to lower the bars so another character can retrieve the upgrade.
Stepping on the pressure pad beneath the upgrade deactivates the ice vent and prevents the bars from closing again so you can now move freely along the ledge.
Before leaving this area, don't forget to light the various braziers (18-22/51) for the brazier challenge. These are shown on the separate page devoted to that challenge.
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