This question came up on another thread but wasn't adequately answered.
I never understood it to be the general protocol that if an agent has once sent around your book, he will always be the agent of record even if another agent eventually sells it.
Especially if you never had a contract with that agent.
But even if you did, I would think it expires when you terminate it. The only case I can see where you'd pay your former agent is if one of the publishers where he submitted your book decided to publish it.
I never understood it to be the general protocol that if an agent has once sent around your book, he will always be the agent of record even if another agent eventually sells it.
Especially if you never had a contract with that agent.
But even if you did, I would think it expires when you terminate it. The only case I can see where you'd pay your former agent is if one of the publishers where he submitted your book decided to publish it.