sarkarey

Ok, So I, like everyone else am stuck on the centaurs, which wouldnt be so bad accept that i've tried loads of help sites and walkthroughs on this part of the game and nothing works! I've been stuck on this part for ages! I have stunned the centaur but i cannot grapple the sheild! everytime I press square the grapplehook comes straight back. it WILL NOT lock on! does that mean there is a glitch in the game? I have even emailed Eidos and they just told me the steps about doing the adrenaline dodge then getting their shields etc. I REALLY need help! Everytime i get them to freeze, and they expose their shields, i CANNOT grapple the hook. Any help would be much appreciated!