<human>: I know this probably sounds stupid in comparison to the stories you guys hear on this sub, but I'm still really shaken up and want to make sure I do the right thing, if there's anything to be done at all.

This crazy man (let's call him CM) has a bit of a reputation for being a loose canon when it comes to other peoples' dogs at the dog park. He'll basically blow up any dog that plays "too rough" with his dog, which to him means any play at all that involves physical contact. Anyone who's seen animals at play can imagine why this is ridiculous. But, I digress. 

Since the park is off leash, and since CM's dog (Hugo) is very sweet and playful, my dog (Reilly) came up to Hugo to initiate play. He's done this before, Reilly and Hugo play well together actually, but the guy usually just yells at/grabs Hugo (his own dog) and removes him.

This time, I wasn't in arm's reach to get Reilly out of the line of fire quickly enough, and the guy lost it. He was screaming and grabbing at Reilly trying to hit him, and then began using the lacrosse stick he was holding to try and beat him. I managed to grab Reilly before he could actually get hurt (or hurt the guy...Reilly is not by any means aggressive with people but any dog can bite when fearful).

I was really, really shaken up. The guy left the park, and I called the police to ask if I could report it, and then realized how stupid I sounded since I didn't have any of the guy's information but his dog's name. There was nothing they could do of course.

Provide a brief overview of the text.
<bot>: no one got hurt, but a crazy dude assaulted my dog with the intent to at the very least do bodily harm.