Bixer, are you talking about this zulag? (just making sure)
If so, did you kill the Slogs? you should kill them by throwing the bomb you have
and then go to the previous screen to posses the Slig (I think you can posses him in any screen..)
I have the PC version, I tried to do what you said, but the Slig shoots Abe quickly, he doesn't say 'freeze'
I don't know is the PS version is different
In short, try possessing the Slig
