Mine Carts
There's another narrow tunnel here opening up to a room with spikes. It starts to fall and you'll get attacked. So use the grenade to stop the parasite and then take out the four pieces along the ceiling - opening up a door. Keep walking until you into one of the mine carts. Shoot at the lever on the eastern wall and jump into the rear cart when they start rolling. Enemies will pile up so be careful.
When the cart stops, target the lever at the far end to make the cart moving downhill. Be ready to jump out of the cart as it crashes below. Once out of the cart, grab the Stone of Sacrifice and get a door to open before using a ladder to climb up to the surface and use the Stone of Sacrifice to open the door and take the lift up.
Moving Hands
There's a path leading up to a room with a bridge. Cutscene occurs and you'll need to circle back to the small room (SW of where you are you) and climb up the ladder to reach the second level. Enemies will come at you so be careful. Once done, look for the third level and switch it on. Now get on the rising hand and jump to the center platform. Hit the switch to make the other hand move, releasing more enemies. Once done, hop down to raise the final portion of the bridge. Be careful of an attack from the rear when this is done and be ready for another cutscene.
When Statues Attack
Run away from the walking statue and be careful of the falling pillar. Dodge it and then use the knife to cut the lock on the door. The statue will still be in hot pursuit. Now into the building ahead, be careful of falling barrels tumbling towards you. Now, try and kill the monsters controlling the level to stop the barrels from falling. Now head upstairs to the tower and watch another cutscene. So pull the lever and kill them all. Once done, get into the lift and activate it. Clear out enemies who want to jump in with you. Now its just easy walking to the merchant's room and off to another part of the tower.
Salazar Speaks
Be careful of another surprise attack, just avoid it properly and you'll be ok. Now turn right to the end of the platform and be careful about the tentacles. Salazar will speak from time to time as the shell at the base will open up (shoot whenever this happens!) Watch for the emerging pattern here and just be ready to dodge and hit whenever you can. Salazar will eventually die, leaving you safe to roam the area and collect the loot. Climb down the robe outside the walkway and walk to meet the merchant. Further on ends this chapter.