Filing is filing right? You don't need to necessarily agree with any of it yet he can still carry on with the D. So best to not have any part in it. When he has the conversation I would not mention again this isn't what you want (he knows that) but I would simply say you've consulted a L and he/she is expecting the paperwork so just have his L contact yours and you will handle it from there.
Whatever's he's doing. Whether it be temp checking, baiting you, etc doesn't matter. He will do what he wants. Don't have any part in it. These conversations just seem to go round in circles with no outcome. He's made big boy decisions he can follow through on them. He really needs some type of new reality to set in before he can even begin to figure out where he's going. Step out of his way and let him do that.
