S4·E21 Funny, They Shrunk Michaelangelo

Episode recap

Task: Write a 280-380 word episode recap for Teenage Mutant Ninja Turtles S4E21 ("Funny, They Shrunk Michaelangelo").
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: "While Michaelangelo is testing out a sailboard in the sewers he accidentally gets swept out into the city harbor."
Sources:
[1] Series is Teenage Mutant Ninja Turtles (1987). Genres: Action & Adventure, Animation, Comedy, and Kids.
[2] Four turtles fall into sewers, befriended by Hamato Yoshi (sent to NY, forced to live in sewers). A strange green glow transforms the turtles into human-like creatures. Hamato (now Master Splinter) changes into a giant rat from the green glow.
[3] Turtles transformed into humanoids by strange ooze. Trained as ninja by Hamato Yoshi (now Splinter). They work with reporter April O'Neil.
[4] Translation/definition of the title.
[5] Streaming info (irrelevant).
The synopsis for the specific episode is extremely brief: "While Michaelangelo is testing out a sailboard in the sewers he accidentally gets swept out into the city harbor."
The episode title provided in the prompt is "Funny, They Shrunk Michaelangelo".
Problem: The synopsis does not mention him being shrunk. It only mentions the sailboard and the harbor.
Constraint Check: "You write ONLY verifiable facts that are explicitly supported by the provided SYNOPSIS and SOURCES."
Constraint Check: "If the synopsis is sparse, stay concise rather than guessing."
Constraint Check: "Never add dialogue, scene order, character names or plot events not explicitly present."
The prompt asks for a 280-380 word recap.
The provided synopsis is one sentence: "While Michaelangelo is testing out a sailboard in the sewers he accidentally gets swept out into the city harbor."
The sources provide background on the series (Hamato Yoshi/Splinter, April O'Neil, the ooze/glow).
If I strictly follow the instruction "If the synopsis is sparse, stay concise rather than guessing" and "Write ONLY verifiable facts that are explicitly supported by the