Cenote – Ambush in the Bone Pit (part 2)

After you've taken care of the 4 enemies that drop down from the upper right ledge, Lara says, "More coming," and you have a moment to regroup. If you need shotgun ammo, there's a box sitting next to the square pillar to the right of the starting position.

You'll also find 2 boxes of rifle ammo near the left pillar, and you can search the bodies for health and endurance herbs, and possibly a few arrows. You don't have much time, though. Grab what you can and take cover behind the left pillar.

The next 2 Yaaxil (7-8) are an archer on the upper left platform, who shoots deadly green arrows, and another warrior that emerges from the lower passageway and circles around to flank you from the left. If you stay behind the pillar, you're safe from the archer.

You can then take out the one on the ground with the shotgun or dodge kill.

When he's out of the way, switch weapons and shoot the archer on the ledge above. One fire arrow will take care of him, but you can use regular arrows, rifle, or pistol if you prefer.

Then quickly turn your attention to the next 2 enemies (9-10), one archer and one without a bow, in the upper right opening. You can detonate the green orb on the ledge...

...to kill them both.

If you only kill the archer, the other will drop down and rush toward you. Deal with him using your preferred weapon/technique.

Meanwhile, 3 more of the painted warriors (11-13) emerge from the tunnels at ground level. The first (11) comes from the middle tunnel and either rushes straight at you or circles around to the left, depending on where Lara is standing.

The second (12) emerges from a tunnel on the lower right.

...and the third (13) emerges from the lower middle tunnel. Again, depending on where Lara is, he may come at you straight on or circle around the left pillar.

Keep blasting/dodging and run away and heal if necessary.

When you've taken care of those three, a short cutscene shows four enemies rushing the wooden gate in the southwest corner.

In the actual game, I only encountered 3 more Yaaxil (14-16), not the 4 shown in the movie. If you ready a fire arrow while they attempt to break down the bars, you can shoot the green container, just inside the gate on the left, as soon as they bust through.

The resulting explosion may kill all three. If not, you can shoot any stragglers. Once you've dealt with these three, the fight is over, and Lara says, "Time to move." Be sure to loot the corpses and pick up the shotgun and rifle ammo near the pillars if you didn't get it earlier.