City of the Serpent – Boss Fight – Dominguez/Kukulkan
Without Fear Arrows (part 3)

He shoves Lara back and resumes his rant about saving Paititi. If you haven't already taken care of the Serpent Guards, they'll appear now to assist him.

At this point, you're probably running low on rifle ammo. So turn and run. Head for the outside of the platform but don't get too close to the edge or the enemies may knock Lara off into the abyss. Then you'll have to continue from the last checkpoint.

Heal and use other herbs as you run around the outside of the platform.

Collect ammo and search bodies as you go.

There's no need to seek out the remaining enemies, but when they happen to cross your path, go ahead and shoot them.

When you've replenished your rifle ammo, either go looking for Dominguez or wait for him to come to you. Use the same basic tactics as before. Shoot him as you move in closer...

...and dodge his attacks as well as you can.

Or, if you're able to maneuver him near one of the red explosive jars (or it just happens by accident)...

...shoot the jar to cause an explosion.

Then keep shooting...

...until the energy bubble surrounds him.

This is your signal to run in close for a third melee attack.

This time when Lara stabs him with the dagger, Dominguez loses his majestic helmet, making him more vulnerable to headshots but much crankier too.

You'll also notice the dagger transferring energy from Dominguez into Lara, even as he boasts about becoming more powerful.