I didn't understand it either. My claims agent said that because something hit the car, it's considered collision. Everything else, comp. I'm still fighting them.
The claims adjustor came out today to look at the door only. I don't like the guy, he was like "yeah, that was probably there before" kinda crap on some things. It may be a 13 year old supra, but these things don't grow on trees. They are rare, and no one beats on a MKIV supra. Sorry, just isn't going to happen. I flat out told him I have hi-res pics from less than a week ago that will show zero damage to all the areas that are now damaged.
As far as prooving when the events took place, that's impossible

However, by the same token suggesting that they are two seporate incidents is pretty hard to swallow too from a logical point of view.
He has to come back out tomorrow for the bumper/hood/targa paint damage. I'm making them replace both headlights, as what ever is on the hood etched the plastic pretty bad. I just friggin polished these too (with pics no less LOL) a week ago.
If I don't agree with his findings, I can fight it right? I just don't like this guy so far. But I guess that's his job, to try to get as low of a cost for the insurance company for the repair.