The tethered move because Red moves.

Peele commits to this as a biological fact — a shared nervous system, a mirror neuron system gone feral, two bodies wired to the same impulse.

The film shows this through choreography: when Adelaide reaches, so does Red, a half-second delay that reads as mechanical constraint. But the actual science of neural coupling doesn't work this way — you cannot synchronize two separate nervous systems through passive biological linkage, though you can give two people the same stimulus and watch them generate nearly identical outputs.

Consider the beach scene. Red and Adelaide mirror each other's movements not because they're neurologically tethered but because they're responding to identical environmental pressure — trauma, memory, the same choreographed threat. The film interprets this as biology, but it's actually just stimulus-response replication, and this is precisely how algorithmic systems operate. Netflix doesn't need to rewire your brain — it feeds you the same content signals that fed millions of others and watches your behavior flatten into the same shape. The algorithm creates a tethered double of you without requiring any biological mechanism.

The horror Peele constructed as biological destiny is already operational as consumer infrastructure.

Peele's production design reinforces the error by showing the tethered as prisoners of biology who must move when commanded because their bodies are slaves to nerve impulse. In the actual world, the replication happens through choice architecture, not constraint — you scroll because the feed is designed to show you what statistically identical people clicked, and you become your double through recommendation, not through forced synchronization. His mistake was thinking the link had to be physical.