CRITICALFailure Reference

Hailuo AI Hand & Finger Artifact — Pre-Generation Risk Reference

Technical Classification

Hand-Anatomy Topology Failure

Hailuo's hand-anatomy failures are common on close-ups and manipulation prompts. The model produces topologically impossible hand structures: 4 or 6 fingers, knuckles bending laterally, fingers fusing during motion. The failure rate is especially elevated on talking-head prompts where hands enter and exit the frame — the hand model receives less training weight than the face model, so transient hands produce the worst output.

How to identify this failure

✕Six fingers visible on one hand at any frame
✕Thumb pointing backward or duplicated
✕Knuckle bending in non-anatomical direction
✕Fingers fusing into single mass during motion
✕Hand orientation flipping between palm and back

Real generation examples

Prompt used

"Person gesturing while explaining a concept on screen"

Failure observed @ 0:02

Left hand showed 6 fingers at 0:02; right hand fingers fused during gesture at 0:04

Prompt used

"Musician's hands playing piano keys"

Failure observed @ 0:01

Knuckle bending laterally at 0:01; thumb merged into index finger at 0:03

Documentation strength

If you need to escalate

VERY HIGH — Hailuo support treats hand failures as a recognised critical mode under their Anatomical Topology escalation category. Refunds routine with timestamped evidence.

AVA is a pre-purchase prevention tool, not a post-purchase recovery tool. Platforms generally do not guarantee credit refunds for output-quality failures; goodwill credits are at each platform's discretion. The strength rating reflects how well-formed your support ticket can be, not a promised outcome.

Prevention + documentation steps

01
Score your prompt before you generate
Run your prompt through AVA's pre-flight scoring against the Hand-Anatomy Topology Failure pattern. Green light = generate. Yellow/red = rewrite using the suggested fix before you commit credits.
02
Capture Generation ID + timestamp if it failed anyway
Find the Generation ID in the URL or share link. Note the exact time when the Hand-Anatomy Topology Failure first appears (e.g. "failure first visible at 1.2s"). Timestamped evidence is significantly stronger than a general complaint.
03
Use the correct technical term in your support ticket
Describe this failure as "Hand-Anatomy Topology Failure". This term maps to a recognised internal workflow in the support system and routes the ticket to the right team.
04
Submit via the correct support channel
Runway has no direct email intake. Pro+ plan: open the in-app AI Assistant (help widget bottom-right of app.runwayml.com), describe the failure with the technical term, attach evidence. Free/Standard plan: human support isn't available — your channel is Discord #community-help with @On Call - Moderators.

Frequently asked questions

Does Hailuo refund credits for hand artifacts?

Yes. Submit the Generation ID with the technical term "Hand-Anatomy Topology Failure" and a timestamped screenshot. Hailuo support refunds documented hand failures consistently under their Anatomy category.

Why are hands worst on Hailuo's talking-head model?

The talking-head model concentrates training weight on the face. Transient hands entering and exiting the frame receive less reinforcement, so hand-topology constraints are weaker on those prompts than on hand-focused clips.

How do I avoid hand failures on Hailuo?

Keep hands out of frame on talking-head prompts unless they're the main subject. Frame hands further from camera. Use ≤4s clips when hands are visible. AVA's pre-flight scanner flags hand-risk prompts before submission.

Score your prompt

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