Hunter Jason (Reboot)\n\n Whether fans liked or disliked the reboot, most can agree that Derek Mears' version of Jason is the stand-out due to his improvements. Jason is portrayed less like a brainless killer and more of a methodical survivalist and hunter.
The "ch ch ch ah ah ah" also conveys the idea that Pamela is actually hearing Jason's voice in her head as she's killing victims. Like the shark theme in Jaws, this whispering let audiences know that Friday The 13th's killer is actually around, even though they can't be seen.