S15·E15 Gimme Shelter

Episode recap

Task: Write a grounded 280-380 word episode recap for Supernatural S15E15 (Gimme Shelter).
Constraints:
Use ONLY verifiable facts from the provided SYNOPSIS and SOURCES.
No invented titles, names, dates, counts, awards, ratings, numbers, or plot points.
Omit details not in the material.
Style: Original, neutral, encyclopedic prose, plain text.
No markdown, no asterisks, no headings, no bullet points.
Word count target: 280-380 words.
SYNOPSIS: "Castiel and Jack work a case involving members of a local church. Meanwhile, Sam and Dean go off in search of Amara."
SOURCES:
[1] TMDB: General info about Supernatural.
[2] IMDb: Creator Eric Kripke, actors Jared Padalecki, Jensen Ackles, Jim Beaver, Misha Collins.
[3] Moviefone: Sam and Dean Winchester lost mother to demonic force; father raised them as soldiers to kill paranormal evil.
[4] Know Your Meme: American paranormal drama, created by Eric Kripke, premiered on The WB in September 2005. Follows two brothers hunting demons, ghosts, etc.
[5] TV Tango: Sam and Dean Winchester travel in a vintage Chevy Impala to find/destroy the demon that killed their mother.
Episode Specifics: Castiel and Jack work a case involving members of a local church. Sam and Dean search for Amara.
Series Context: Supernatural is an American paranormal drama created by Eric Kripke. It follows brothers Sam and Dean Winchester. They hunt demons, ghosts, and other supernatural figures. Their father trained them to kill paranormal evil after their mother was lost to a demonic force. They travel in a vintage Chevy Impala.
The synopsis is extremely brief: "Castiel and Jack work a case involving members of a local church. Meanwhile, Sam and Dean go off in search of Amara."
The sources provide series-level context but very little episode-level detail.
The word count requirement is 280-380 words.
Problem: If I only use the provided facts, I cannot reach 280 words without being extremely repetitive or including a massive amount of series background. However, the instructions say "If the synopsis is sparse, stay concise rather than guessing."
Conflict: The user asks for a 280-380 word recap, but the provided synopsis is only two sentences. If I follow the instruction "If the synopsis is sparse, stay concise rather than guessing," I will fail the word count requirement. If I follow the word count requirement, I will have to repeat