VaNiDgE posted at 5/30/2009 8:16 PM "How do I execute Adrenaline Attacks? Not quite sure how to do them."
From rikku4788's Tomb Raider: Underworld FAQ http://www.gamefaqs.com/console/ps3/file/936842/55272
"See how there's a green Lara representing her health? and the Lara next to her was your air meter? Well that Lara is also used for building up adrenaline. You'll see it filling up as you fire at enemies. When it turns yellow, it's time to unleash the wrath of Lara...ahem. Anyway, run towards an enemy and press "Q", this will make Lara rebound off the enemy entering into slow motion. Use your mouse to move the red cross hair into the circle in the middle of the screen, as soon as it does, press fire to complete the head shot...its a damn lot easier to do than the "adrenaline dodge" from Anniversary and its not compulsory to learn, its just for fun and makes killing killing enemies alot easier :)"
As you're on the PS3, let's add Stellalune's TR:U Controls FAQ. http://www.tombraiders.net/stella/walks/controls/TR8controls.html
"New in Underworld: This special move can only be used when Lara's adrenaline meter becomes full (see On-Screen Display below). When that happens, press and hold Target Lock to keep a single enemy targeted. Move close to the enemy and press Grapple. Lara jumps toward the enemy and rebounds off, as in the Enemy Vault maneuver. Time slows, the screen blurs slightly, and two targeting reticules appear on the screen. Use the mouse or right stick to aim the small, red reticule inside the gray ring on the enemy's head. When the gray ring turns red as well, then fire. A successful hit results in an instant kill, regardless of the enemy's size.
NOTES: If you're having trouble with this because the aiming reticule controls are inverted (i.e., left/right and up/down are reversed), this can be changed in the Game Options menu under View Axis. Also, there are several YouTube videos demonstrating the technique."
There are links at the page to On-Screen Display and the Youtube Videos.
You just lock on to an enemy (R2), get close to it, press square to jump of of it, bring your reticule inside the grey circle on the enemy's head as fast as possible, and shoot. It's in the instruction manual. --- "Once upon a time there was this guy. And he was awesome. The end. Except that his parents were murdered. To death. BY MURDERERS."