S8·E12 As Time Goes By

Episode recap

Task: Write a 280-380 word episode recap for Supernatural S8E12 (As Time Goes By).
Constraints:
Use ONLY verifiable facts from the provided SYNOPSIS and SOURCES.
No invented titles, names, dates, counts, awards, ratings, box-office, viewership, or plot points.
If a detail is not in the material, omit it.
Write original, neutral, encyclopedic prose in plain text.
No markdown, no asterisks, no headings, no bullet points.
Word count target: 280-380 words.
TMDB Episode Synopsis: Sam and Dean are stunned when a man who claims to be Henry Winchester, their grandfather, suddenly appears in their hotel room demanding to know where he can find John Winchester, their father.
Series Sources:
Series title: Supernatural.
Created by: Eric Kripke.
Cast: Jared Padalecki (Sam), Jensen Ackles (Dean), Jim Beaver, Misha Collins.
Premise: Brothers Sam and Dean Winchester follow their father's footsteps as hunters, fighting evil supernatural beings like monsters, demons, and gods.
Background: They lost their mother to a mysterious and demonic supernatural force; their father raised them to be soldiers/hunters.
Broadcast history: First broadcast on The WB, later The CW. Ran for 15 seasons from September 13, 2005, to November 19, 2020.
The episode synopsis is extremely brief: "Sam and Dean are stunned when a man who claims to be Henry Winchester, their grandfather, suddenly appears in their hotel room demanding to know where he can find John Winchester, their father."
The sources provide general series information but almost no specific plot details for S8E12 other than the synopsis provided.
Problem: The user wants a 280-380 word recap. However, the provided synopsis is only about 35 words. The instructions strictly forbid inventing plot points, dialogue, or scene order not explicitly present.
If I follow the instructions "If the synopsis is sparse, stay concise rather than guessing" and "Never add dialogue, scene order, character names or plot events not explicitly present," I cannot reach 280 words without violating the core instruction of only using provided facts.
Constraint Check: "Write a grounded 280-380 word episode recap... Use only supplied facts. Never add dialogue, scene order, character names or plot events not explicitly present. If the synopsis is sparse, stay concise rather than guessing."
This is a contradictory prompt. A 280-380 word recap is impossible if the only plot information provided is one sentence.
*