NOTE: This walkthrough explains how to get through this section without touching the time bomb. If you don't care about beating the time bomb challenge, or if you are doing the 7-minute challenge and need to blow the wall open as quickly as possible, just follow the same basic steps using a combination of remote bombs and grabbing/rolling to move the time bomb.
When you reach the second bricked-over doorway, continue downstairs to the right.
Pull the golden handle to open the gate made of spikes. When the handle retracts, the gate closes, so move through quickly.
Destroy several skeletons as they arise.
Hop down into the area on the right, where you'll find another time bomb. If you're going after the time bomb challenge, do not touch the bomb!
Before or after attempting to blow up the crumbling wall, go after the MAX HEALTH UPGRADE hovering in the alcove. If you're trying not to touch the time bomb, place a remote bomb behind and to the left of it.
Raise the staff to prevent the time bomb from exploding as you proceed. Then detonate the remote bomb to blast the time bomb across the room and into the alcove.
Jump on top of it to reach the upgrade. Move away, lower the staff, and let the bomb explode. Another bomb will then drop from the ceiling.
Now it's time to maneuver the time bomb up to the crumbling wall. Place a remote bomb behind the time bomb and a little bit to the right of it. Pull the golden handle to retract the spike gates on either side of it. Raise the staff and continue to hold it up as you go. Detonate the remote bomb to shift the time bomb to the foot of the stairs.
Use another remote bomb to propel the time bomb up the stairs...
...and another to push it against the wide gate made of spikes.
Lara can't get through this gate, so run up the stairs on the right...
...and drop down near the first golden handle. Pull it to open the spike gate.
Then detonate your remote bomb to push the time bomb across the room toward the next set of stairs.
Repeat the process to get the time bomb up the stairs...
...and maneuver it against the crumbling wall. Now you can lower the staff and let the bomb explode.
Meanwhile, a swarm of scarabs comes down the stairs on the left. If you like, you can try for the Challenge: Kill 4 Scarabs with a Single Bomb. I found this impossible in single-player, since you only get 2 scarabs at a time. If you don't get it here, there will be other chances.
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