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For much of season 5 of *Stranger Things*, Holly Wheeler and Max find themselves trapped in a realm of memories constructed from the past of Vecna. Their quest for an escape route in "Escape from Camazotz" leads them to relive a traumatic incident from Henry's early years—a discovery that could contain the key to defeating him permanently.

Editor's Note: This discussion contains major spoilers for *Stranger Things* season 5, volume 2.

The Discovery in the Mine Shaft

Upon meeting Max in the psychic realm known as Camazotz, Holly discovers she is taking refuge in a grotto that Henry avoids at all costs. By leaving the lens cap on a spyglass found in Henry's old home allows Holly to realize that the true terror lies not within the cave. Matching her view through the cap, she and Max suddenly fall into a subterranean passage.

They watch a child version of Henry encounter an man who is hurt and scared. As the boy offers aid, the man fires a gun, wounding the boy in the hand. Fighting for his life, Henry ends the threat with a rock. "Did this make Henry evil?" Holly questions through tears. The answer is affirmative, but the act went deeper than a defensive killing.

Like many elements of the final season, the significance of the encounter originates in the live show Stranger Things: The First Shadow.

An Interdimensional Incident and Stolen Research

The play reveals the 1943 event, which transported a vessel into a dimension known as the Abyss. It faced creatures, and the lone returnee was the captain, who emerged in a vegetative state with an entirely new blood.

This man's son, a young Martin Brenner, wanted to repeat this phenomenon in the Nevada desert. But a disloyal lab worker stole research materials to sell to the Soviets, who were eager to begin their own interdimensional projects. This spy in the mine shaft is that employee.

So, What's in the Case?

Considering what is known about the doctor's experiments, the briefcase would assuredly have some of the altered blood. As shown, Henry is bleeding from his hand. He likely becomes contaminated upon handling the contents, which triggered the origin of his telekinetic gifts—abilities he would later pass on to the test subjects under Brenner's care.

A second theory, the container could have held exotic matter that was destined to travel to Hawkins Laboratory, where it maintains the stability of the mirror dimension. The stage play explains that the boy ended up in the Abyss, returning after half a day with a new blood type and personality. As a youth, he fights the whispers of a sinister presence, reminiscent of how the character Will was possessed by the shadow monster in the past.

A Weaponized Emotion

The reason Henry avoids the cave of that cave demonstrates how deeply scarring the incident was for him. While he orchestrates the army of monsters and seeks to merge the Abyss into Hawkins, a fragment of his psyche remains. Vecna uses fear, and the series is building toward a climactic battle between the monster and Will, who has overcome his own deepest fears to fortify himself.

Will's growth has effectively disarmed Vecna. Furthermore, Will now understands what his enemy truly fears, and this may grant a critical advantage in the series finale to come.