Grab as many of the 4 health packs as you need and advance toward the bag of gems. Lara correctly assesses that this is a trap as the gate closes behind you and the drawbridge you're standing on begins to retract.
Shoot the Eye of Horus switch across the gap to raise a wooden ledge above.
Then when a time bomb lands on that ledge...
...raise the Staff of Osiris to extend the block with the glyphs on it, pushing the bomb off the ledge onto the drawbridge where you're standing. If you are attempting the challenge, do not touch the bomb.
Just stand at the outer corner of the drawbridge, lower the staff, and let the drawbridge retract until the bomb explodes against the crumbling wall.
Then run through the opening.
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