I use the term "relay" in hog hunting, when you catch one hog and the dog(s) leave on another hog as soon as you get there and leg the hog. I think a lot of guys calling it "rolling out" or something like that.
Is this what you were referring too?
I did see a post the other day that called it this. You may have it right there. Generally, I call it rolling out myself. Either way, I like a dog that does it.