Scene and sequel are two types of written passages used by authors to advance the plot of a story.
Scenes propel a story forward as the character attempts to achieve a goal.
[1] Sequels provide an opportunity for the character to react to the scene, analyze the new situation, and decide upon the next course of action.
Dwight V. Swain, in Techniques of the Selling Writer (1965) defined a scene as a unit of conflict, an account of an effort to attain a goal despite opposition.
[1] In The Art of Fiction (1983), John Gardner described a scene as having an unbroken flow of action without a lapse of time or leap from one setting to another.
[3] Over the years, other authors have attempted to improve on the definition of scene, and to explain its use and structure.
Maybe there is unspoken tension between characters, internal conflict for the protagonist, or new information is discovered.