Did you try the grenades/grenade launcher in the water?
And Vamp, being a vampire?
Well its not as far fetched as it seems.....to explain him you really need to play MGS4
You'll be like "oh I see" lol
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Yeah but they are so hit and miss, mostly miss, I can get him down to virtually nothing, mainly by a combinaiton of rockets when he on the rails, and c4/claymores when hes running around, but then he completly spazz'z out on you and you cant even get a chance to shoot him.