Stuck In Space...

Hi everybody my problem is quite simple actually.

I'm playing Dead Space (Awesome Game BTW) and I'm in the last boss, the Big Boss

Now I tried numerous times to beat this boss but with no success

I looked in GS game guide and the video on how to beat him

but the monster doesn't act in the game as it on the video after shooting the big yellow balls

it continuous to Breath/yell at me and wont send the spikes after me

after this story my question is: My copy the game is bad or what?

thanks for helping

While its a video of the xbox version, this should show you how to do it.

http://www.youtube.com/watch?v=tA63Z_2vjnU

Very, very funny commentary btw

thanks everyone for the huge help now I know what to do

insted of stand and shoot at the damn thing