Im at the part in the main quest where you have to trap odahviing and interrogate him. Well after I talk to him and let him go,he attacks and we fight all over again. It keeps telling me to speak with him but I can't. Is this a bug? Help...

Sounds like a bug, because I finished the MQ and he doesn't do that at all. Restart from a previous save.

He did the same to me. I had to wait until the other people around us left.