For the third time, this is a bug entirely of your own making because you haven't thought through what you've doing.

Read my previous post, which anticipated the code you'd changed and the change you made. I carefully described exactly what the unmodified code does in plain English.

If part of the trace is in the open air and part of the trace is in the water, then the answer to the question of whether the monster can see its target is NO (because the line of sight passed through the surface of the water).

Look at the change you've made to that portion of the code, and make the corresponding change to that paragraph of text. Then post the paragraph of text. 

Preach, dude I appreciate you helping me out lot before man, but now feels like there's passive aggressiveness .... I don't get where it's coming from?

I suggested you could just tell me the code fix, as opposed to trying to explain the programming theory behind it... I obviously am not a programmer