Your problems are over i have found a way to defeat the cenaturs an easier way. Thanks to Stella's Tomb Raider Anniversary Walkthrough - Windows PC, PlayStation 2, Xbox 360 & PSP

If you're having trouble with the strategy above, or if you just want to try something different, here's an alternative to direct combat in which you trick the centaurs into killing themselves:

When the battle starts, save manually in a new save slot just in case this method doesn't work for you. It does not work for everyone, and if it fails, you will be stuck in a bad spot and unable to continue without reloading the earlier save.


Target one of the centaurs so its health bar appears in the top right corner of the screen. Then run to the edge of the ledge and jump into the water above the tunnel that leads to the switch—just to the right of where the edge of the island forms a little square notch. (This screenshot shows the spot.) Do not jump into the water anywhere else or you won't be able to avoid the centaurs' fireballs and Lara will die. Quickly swim down into the tunnel, using a medipack or two on the way if Lara does get hit by a fireball. At the end of the tunnel, climb out of the water on the ledge with the switch. CHECKPOINT 10 registers again.


Now just wait and watch as the centaur's health bar gradually depletes (as shown in this screenshot). I can only guess what the two of them might be doing to each other as they wait and wonder what happened to Lara, but whatever it is, it's not doing them any good. While this is going on, you can take a bathroom break, get a snack, do your nails, whatever. It will take a while, but eventually the first centaur will be reduced to zero health and die. You'll know this has happened when the yellow health bar disappears.


Unfortunately, the other centaur won't do the same thing until you've gone back out and gotten a target lock on it. This is the tricky part. You need to swim to the end of the tunnel and up to the surface. Then very quickly climb out of the water before the centaur can fire-bomb Lara to death. You may need to use a few health packs to do this. Take a couple of shots at the centaur, so you can see its health bar, and then swim back to the switch and wait for it to commit suicide. When it's dead, the cut scene kicks in.


Alternately, after killing the first centaur this way, you can swim to the surface, pick up the shield it dropped and use it to beat the second centaur. You won't need to take the second centaur's shield, just enrage it until it uses the green petrification ray, reflect the ray back at the centaur to petrify it, and shoot it until it comes after you again. Repeat the process until it is destroyed.


TRUST me it works my mom has been playing against them for 5 weeks i showed her this she beat them in 15 minutes.

Do exactly what is says be very patient.