Effect: Defeat the T-Rex without losing ANY health
The Lost Valley
To play it safe, run into a cave along the right-hand wall of the valley (not the first alcove as it's far too shallow). The opening is just below the bridge. Follow the cave and you'll find a raptor. Keep on going to an opening higher in the valley wall. Then wait and shoot the T-Rex from safety. IF YOU TRY IT - PLEASE RATE IT!
Effect: An easy way to eliminate the T-Rex on the Lost Valley.
While fighting the T-Rex.
When the T-Rex approaches, jump backwards, constantly firing. When it comes near, jump to the side so it doesn't clutch Lara in its jaws, then dash under it while shooting and roll to face it. Side jump while shooting and dodge its sharp teeth. Keep doing this until the mighty beast falls.
Go to the pool and make her run out of air and almost out of health then surface. Now quickly climb out of the pool and jump to the door. Do training exercise five but instead of tapping backwrads. Backflip, CRUNCH!
Although you miss the secrets, you can kill Larson when you have collected the Scion piece and have gone past the boulder in the passageway. If you don't mind missing the secrets, shoot at him from the safety of the doorway.