2-Person Mechanics Question

[Mregor]

I worked my first 2-person in a while and was told there was a mechanics change last year. Now, I'm the new guy in town and don't know if they are just screwing with the new guy. Situation was he was T table side and had a violation where ball would be taken out on his sideline table-side. I came over from my position as lead opposit to inbound (bump and run). He told me there was a mechanic change that the association/assignors were emphasizing that says when it is his line, his call, going the other way, they stay and make the switch. It makes no sense that I can see and I told him so and he was adamant about the change, even after the game. We had another situation later in the second half where there was a b/c violation and I bumped him again and he reitterrated his objection to my bump. I either fell for the new guy trick or I fail to see the logic behind this. Anyone?

Mregor