Waterlurker with bloodlust then random fatigue

[Bennick]

The way a waterlurker works is, when you're on the same altitude as him in the level, he starts chasing you and the music plays, right? Well the beginning of this particular map that I have is on the same y axis position, but nowhere near my waterlurker. Regardless, you start hearing the music and he starts trying to chase you through a wall. Within a few seconds, though, the music that's supposed to be playing plays. Did I mention that I have the waterlurker set to inactive at first and set to activate upon entering a script area later and he does this anyway?

Not to mention, when I finally get to the part where he's supposed to come after me, I can wade out into the water, take a leisurely stroll, try to find him, smack him across the face a few times (not that I could find his face ) and he WILL NOT chase me! What the heck is going on?? Can somebody help me?