"Loop dialog" is not a commonly used phrase in drama or screenwriting. It's possible you're referring to a specific situation or technique that's not widely known by this name.
To help me understand what you're referring to, please provide more context:
* Can you give an example of what you mean by "loop dialog"? For example, "I heard about a drama technique called loop dialog, where the characters repeat the same line over and over."
* What type of drama are you interested in? (e.g., TV show, play, film)
* Are you thinking of a specific play or film?
With more context, I can help you understand what "loop dialog" might refer to.