Diagnose why a short-form video underperformed

Diagnose why this video underperformed.

Narrow by where viewers left:
1. **Left in the first seconds** — a hook problem, or a mismatch between the thumbnail and the opening. Nothing later in the video matters.
2. **Left in the middle** — pacing, a promise not being delivered fast enough, or a section that adds nothing. *This is the most common case and the least often diagnosed, because people remake the hook instead.*
3. **Watched through, no engagement** — content worked, the ending gave no reason to act.
4. **Watched and shared, low reach** — not a content problem. Say so rather than proposing content fixes.

For the identified problem:
- What specifically in this video caused it, quoting the script or describing the moment.
- What the comparison video did differently at that same point.
- The single change to test next.

Then:
- What **not** to change. If the hook is working, remaking it wastes the one thing that worked.
- Whether the metrics are even sufficient to conclude anything. *One video is not a sample* — say when the honest answer is that this is variance and to post more before concluding.

Rules:
- Do not give a list of general best practices. Diagnose this video.
- If the metrics I gave you do not distinguish between causes, say what metric would.