When you enter this room, the door closes behind you. At first, only the incubator on the far side (#1) is active.
NOTE: This is a rare case when an incubator is active but the arms supporting the egg aren't moving. I can only assume it's a minor bug.
As long as you don't approach the incubator, you can pick up 4 sets of Uzi ammo (43-46, two pickups, four items) near the entrance without any interference.
Then draw weapons and move along the right (west) wall toward the incubator.
A centaur mutant (26) hatches out. Do the back-flip...
...side-flip routine to avoid its projectiles as you shoot it...
...until it explodes.
Cross the room and throw the switch to the left of the empty incubator to open the exit. This also activates the 2 incubators above.
As long as you don't step on either of the low, fleshy ramps next to the door, the eggs won't hatch and you can leave at any time.
If you want all the kills, you can hatch the remaining eggs and fight the 2 mutants (27-28) that emerge. I highly recommend the alternative strategy below, but if you need to get it done quickly, at least try to fight them one at a time. Throw the switch, draw weapons (preferably Uzis), then walk forward just as far as the first ramp. If you only step on the near edge of that ramp, as shown here, only the catlike mutant above will hatch.
Backflip away while firing, dodge/roll as needed, so it doesn't trap Lara against the wall...
...and take it down as quickly as you can.
Then step forward onto the part of the right ramp closer to the doorway, and the flying mutant will hatch from the other egg.
Backflip away, then flip side to side while firing...
...to (hopefully) destroy it before it gets too close.
- OR -
Alternatively, after picking up the Uzi ammo, destroying the centaur mutant, and using the switch, as shown above, run diagonally across the fleshy ramp on the right to hatch both remaining eggs. Hurry through the door. (In New Game+ there's a save crystal here.)
...and slide down into the next area.
There are 2 more mutants (29-30) running around here. The safest way to deal with them is to veer to the right...
...and run/jump forward between the dark rocks in the near right corner. Then climb onto the angled black pillar against the right (south) wall. Here Lara will be safe from the mutants.
Shoot them with pistols from above. Just be careful not to target Lara's fleshy doppelgänger, who will be standing on the similar light-colored ledge on the far side of the room. You must avoid harming her for an upcoming achievement/trophy. We'll cover that shortly.
If you want all the kills, once the 2 scampering mutants are dead, return to the bottom of the ramp and shoot the 2 mutants in the room above. This may take a little while, but it's easily be done with pistols. (Your kill count should now be 30 if you haven't avoided any enemies.)
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