Offshoreonly.com - What to do?

Had an issue on the water with another boater (thank god no problems with my boat) this evening.
I had dinner at La Parma On The Bay (dockage availible for a few boats), and it was around 7 something. I have no running lights, so I went all the way to my home dock before it got dark.
As I was approaching my dock, I see a ski boat (had to be a 1990 or newer), single i/o, open bow (had to be 17ft or longer), at almost full throttle, pulling a skier. (the whole bay's speed limit is 5mph no wake.) He was WAY faster then 5mph, and was making LOTS of waves. Now, this is part of the bay where the harbor patrol dont always come down every single day. More residential, quieter area then the rest of the bay.
So, I see him and i stop in neutral, stand up and give him that "slow down" hand motion. He shoots past me (too close, also) and he is waving for me to back off im doing something important here....

I see that he's very "into" what he's doing and he doesnt slow down to stop pulling the skier.
So, he keeps on going down the bay where the bay gets smaller and smaller, more houses with docks (the boats on them are rocking like mad when the waves come).

I've gone up to other boaters and told them to slow down before, and they politely asked why (because they probaly didnt know) and they never went fast again. Thought the same would happen this time.

I continue cruising down where he headed when I see that the skier had fallen off and was swimming, so with that, I go alittle faster, hoping to catch him before the guys boat gets up and moving. I approach him and i turn off my engine and heres how the convorsation goes:

(make note that he was screaming his head off at me. This guy is just about middle aged, almost bald with a pot belly.)

him: what the fcks wrong with you, huh?!!!!

me: you gotta slow down!! you are going too fast, the bay is 5 mph no wake speed limit, i think i will call harbor patrol! watch it!

him: you know what?! get the fck outta here!!

me: no no, you cant be playing around down here at this time of night causing a wake and such...im calling harbor patrol..

him: get outta here motherfcker!!! i'll fckin slice you in half!! where do you live boy?! i'll find out where you live and fck you up, and fck up your goddamn boat!

me: hell no, i aint tellin you nothing! (starts engine)

(meanwhile, he is telling the skier to get onboard quickly, and he is turning on the engine in a hurry)

him: thats it motherfcker, you are gonna get it!

I push my throttle as far as it would go, and shoot back to the dock. I get to the dock, throw it in reverse to avoid hitting the other dock, turn the engine off, tie up the bow, and run for my life!
The ******* seemed to be speeding without the skier probaly to see what dock I went too. I tried to see what dock he went too, but he was gone and i was pissed that I didnt see where he went...(by that time it was dark)

problem is, i couldnt make out what manufacturer made the boat, couldnt see any boat registration numbers, but i did get a good look at the guy, and his passanger.

And in the process, he made me loose my boat keys ( i tripped while running away on the dock)
I hope i go down there tomorrow and find my boat safe and not damaged (like the fat chump said, he'd damage it)

So......what do i do now??

Thanks

Sam