WRITING TIP No 388
No, you do not need to stop the momentum of a scene to immediately describe the new character who just entered.
You have plenty of time and space to detail them in bits and pieces over the course of the whole MS.
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@awesomejohn Unless, of course, the character's entrance is akin to the Kool Aid Man... :)
@sleepingbearcat If more characters came blasting through the walls, I think I would still be enjoying editing as much as I do coaching.