As you come down the hill from the CHAMBERS OF TULUN, turn left and go through the iron gate. Then turn right and follow the street to the west.

Stop near the alcove in the right (north) wall and leave the bike here for now. If you missed the GRENADE GUN and small medipack in the alcove, you can get them now.

If you followed the walkthrough and didn't explore this area on your first pass through this level, you'll meet a sniper standing on a ledge on the left side of the street, a bit farther to the west. You can run at him with guns blazing if you prefer. Or, approach cautiously, staying close to the left wall, to trigger his appearance.

Then move behind the wall as soon as he starts shooting.

Retreat along the street a bit more, then step out to the right until you can see him but he can't target Lara.

Shoot him in the leg using the revolver + laser sight (with or without the laser sight bug).

Then get back on the motorcycle and drive down the hill past the sniper's ledge. Turn right...

...and run over another soldier just around the corner, but take care not to drive on into the very deep pit at the top of the next slope.

Position the bike for a long run-up on the left side of the hill. (Here I had to get off the bike in order to get a wide angle view.)

Hold Action along with Sprint/Dash to activate the nitro for the extra power needed to jump across the pit.

The camera shifts in a disconcerting way, but just keep racing straight on up the slope.

If your speed and angle are good, Lara will make it across.

On the other side, turn right and run over a third soldier. Then stop and and dismount.

[City of the Dead Walkthrough]