The necklace went up and over

What two cameras saw

On September 10, 2025, during a public event at Utah Valley University, a man wearing a stainless-steel chain necklace was the subject of a sudden energetic event at his upper body. Two independent recordings — a side-view captured at 60 fps native and exported by the InShot editor at 120 fps playback (slow-motion), and a rear-view from a stage-position camera — capture the same brief window from two geometric perspectives. All side-view timestamps in this analysis are computed against the source avg_frame_rate (≈ 61.24 fps) and therefore represent real-world event time, not editor-rendered playback time.

Each recording independently documents the same physical outcome: the chain travels upward and posteriorly from its rest position at the front neckline, passes over the back of the head, and comes to rest draped across the left shoulder and down the back of the body.

This analysis is published as part of the independent forensic record relevant to State of Utah v. Tyler Robinson (preliminary hearing May 18, 2026). It is not a physics model or a simulation. It is a direct presentation of frames extracted from two source recordings, with synchronized stage markers identifying matching points across both angles. The science either holds up under examination or it does not — and source files for every observation are linked below for independent verification.

Same event, two geometries

Use the stage strip to navigate the eight observable stages of the event window. Each stage is anchored to two simultaneous frames — one side-view (60 fps native source) and one rear-view (stage-position camera) — sampled at every interval. The two angles independently document the same physical sequence. Each stage is documented by frames from all three source recordings, aligned to matching physical configurations rather than identical timestamps (each camera captured at a different fps and started at a different absolute time). Stage timestamps are local to each source file.

◆ Side View

60 fps native · 120 fps playback

InShot_20260328_
173821094.mp4

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Side-View · Stage 01 Subject in 3/4 profile. No disturbance. Chain not visible at this moment (rests under shirt collar at front of body).

◇ Rear View

Stage-position camera

Screen_Recording_
20260313_112029.mp4

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Rear-View · Stage 01 Subject seated at desk facing crowd. View from rear-stage camera. Chain not visible from this angle when at rest in front position.

The chain that cleared the head

The necklace is a 4 mm stainless steel box-link chain in the style of David Yurman, approximately 26 inches in length. At rest, it sits at the front neckline of a typical t-shirt collar, with the clasp at the back of the neck. The physical specifications below were verified against the recovered chain and against retail specifications for box-link chains of this dimension and material.

The chain went up, back, and over

The three video angles document the same trajectory geometry. The chain begins at the front neckline (Stage 01 — Baseline), responds to an initial disturbance (Stage 02), is launched upward and rearward at the energetic event (Stage 03 — Launch), ascends behind the back of the head (Stage 04 — Ascent), reaches maximum visibility draped across the back of the head (Stage 05 — Apex), descends as the trajectory completes (Stage 06), settles over the back of the head with hair displaced (Stage 07), and comes to rest across the left shoulder and down the back of the body (Stage 08 — End State). The path of the chain bulk is incompatible with any horizontal-only impulse mechanism — the chain must have received an impulse with a vertical component to travel from the front of the body to the posterior end-state.

One link went the other way

At the moment of the energetic event, a single broken link from the chain is observable in the side-view footage as a small bright object departing forward and toward the viewer's right — in the direction opposite the chain bulk's trajectory. The link is approximately 1–2 pixels wide in the source frame, visible against the contrasting red of a MAGA hat in the foreground crowd. The InShot zoom-annotated version of the side-view footage (file InShot_20260405_145048774.mp4) magnifies this region of the original frame to make the feature visible to the unaided eye.

Because the link is observable in a single frame only, its trajectory is not tracked across multiple frames. The single-frame observation is documented for transparency; the forensic significance lies in the direction of departure, not in a continuous trajectory measurement. Open the Link Evidence button above to see the source frames and the conservation-of-momentum analysis.

Two observations, one conclusion

Two independent recordings, captured by different devices at different geometric perspectives, document the same physical event window. Each of the two observations below is independent — each could be presented and defended on its own evidentiary merit. The two observations are presented here together because they converge on the same conclusion.

Verify it yourself

Every observation in this exhibit derives from raw video files listed below. The frames embedded in the side and rear panels are extracted directly from these sources with no compositing, no rendering, and no augmentation. The InShot zoom-annotated version of the side-view source is included separately so that the single-frame link departure can be examined at the magnification level used by the InShot author.

For the underlying energy budget, chain physical specifications, and integration with the broader epicenter analysis, see Section 04 — The Epicenter and Section 13 — Circuit Board Trajectory Analysis on the main page.