They weren't trespassing, they were invited!
Aside: why do Americans always talk about trespassing as something that is done to the trespasser? Isn't trespassing the act itself? If I plant myself in your livingroom uninvited, then surely I am trespassing. Why do so many people instead say that I "get trespassed"?
Because in semi-public places, like a store, you are only trespassing if you've been told to leave (you are trespassed).
the trespasser got trespasserized* by the trespassee, who was trespassed against when the trespasser did a trespass on them
* trespasserified
Because it's a common phrase? Same as "get carded"?
English is flexible; almost any combination of words can start to have meaning.