S6·E17 My Heart Will Go On

Episode recap

Task: Write a 280-380 word episode recap for Supernatural S6E17 (My Heart Will Go On).
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.
Omit details not in the material.
Style: Original, neutral, encyclopedic prose, plain text.
No markdown, no asterisks, no headings, no bullet points.
Length: 280-380 words.
Synopsis: Balthazar changes history and keeps the Titanic from sinking. Fate intervenes and begins killing those that would have died on the ship. Castiel tells Sam and Dean that Fate is very upset with the two of them. The only way they can stay alive is to kill her.
Sources:
[1] Supernatural (2005) is a TV-14 Drama, Mystery, and Sci-Fi & Fantasy series.
[2] Created by Eric Kripke. Broadcast on The WB and later The CW for 15 seasons (Sept 13, 2005, to Nov 19, 2020). Follows brothers Sam (Jared Padalecki) and Dean (Jensen Ackles).
[4] Sam and Dean Winchester lost their mother to a mysterious and demonic supernatural force. Their father raised them to be soldiers to kill paranormal evil.
Episode Specifics:
Title: My Heart Will Go On (from prompt).
Season/Episode: S6E17 (from prompt).
Plot: Balthazar changes history so the Titanic does not sink. Fate intervenes and starts killing people who were supposed to die on the ship. Castiel informs Sam and Dean that Fate is upset with them. To survive, they must kill Fate.
Drafting Attempt 1 (Mental Outline):
In the Supernatural episode titled My Heart Will Go On, Balthazar alters history by preventing the Titanic from sinking. This change causes Fate to intervene. Fate begins killing individuals who were originally destined to die on the ship. Castiel informs Sam and Dean Winchester that Fate is very upset with the two brothers. Castiel explains that the only way for Sam and Dean to stay alive is to kill Fate.
Wait, the word count requirement is 280-380 words.
Problem: The provided synopsis is extremely short (approx 45 words). The sources provide general series info but nothing about the specific episode's plot beyond the synopsis.
Constraint Check: "If the synopsis is sparse, stay concise rather than guessing." AND "Write a grounded 280-380 word episode