S15·E17 Unity

Episode recap

Task: Write a 280-380 word episode recap for Supernatural S15E17 (Unity).
Constraint 1: Use ONLY verifiable facts from the provided SYNOPSIS and SOURCES.
Constraint 2: Do not invent/guess titles, names, dates, counts, awards, ratings, etc.
Constraint 3: If a detail is not in the material, omit it.
Constraint 4: Write original, neutral, encyclopedic prose in plain text.
Constraint 5: No markdown, no asterisks, no headings, no bullet points.
Constraint 6: Word count target: 280-380 words.
Synopsis: Dean hits the road with Jack who needs to complete a final ritual in the quest to beat Chuck. A difference of opinion leaves Sam and Castiel behind looking for answers to questions of their own.
Sources:
[1] Series overview: Sam and Dean Winchester.
[2] Series info: Created by Eric Kripke. Aired on The WB and The CW for 15 seasons (Sept 13, 2005 - Nov 19, 2020). Sam played by Jared Padalecki, Dean played by Jensen Ackles.
[3] IMDb: Created by Eric Kripke. Cast: Jared Padalecki, Jensen Ackles, Jim Beaver, Misha Collins.
[4] Cast/Crew: Sam and Dean Winchester lost mother to demonic force. Father raised them as hunters.
[5] Simple English Wikipedia: Horror, drama, fantasy, fiction. Created by Eric Kripke.
Episode: S15E17 (Unity).
Plot: Dean and Jack travel together. Jack must complete a final ritual to defeat Chuck. Sam and Castiel are left behind due to a difference of opinion. They are looking for answers to their own questions.
Characters mentioned in synopsis: Dean, Jack, Sam, Castiel.
Characters mentioned in sources: Sam Winchester, Dean Winchester, Jared Padalecki, Jensen Ackles, Jim Beaver, Misha Collins.
The synopsis is extremely brief.
The word count requirement is 280-380 words.
Problem: If I only use the provided facts, I cannot reach 280 words without repeating myself or adding information not in the text.
Constraint Check: "If the synopsis is sparse, stay concise rather than guessing." vs "Write a grounded 280-380 word episode recap".
Conflict Resolution: As an archivist, I must follow the "ONLY verifiable facts" and "If a detail is not in the provided material, you omit it" rules. If the synopsis is only two sentences, a