Thank you, and I agree, I made him wait around a bunch to give the player just a bit of time to explore without having to worry about him, but if you're waiting for them to go away it gets annoying. The ringing noise was meant to cause slight discomfort when being around him, but I went waaay overboard.
I think the ringing noise itself is actually great! If you are familiar with using a parametric EQ tool: I think if you throw it into Audacity or Adobe Audition or something and use an EQ to soften the higher frequencies it'll accomplish the discomfort while becoming a little easier on the ears. If you haven't messed with EQs before, they aren't so scary, you could probably understand what you're looking at with one after a quick google.