*Walt is in the desert, humming to himself and building a device synced up to his car keys.

from Breaking Bad (Ft. Vince Gilligan) – Felina on Rap Genius

Meaning

All the device did was moving horizontally on a 90° degrees arch. Wall will then mount the M60 on top of it and place it inside the trunk of his car, waiting for the right moment to activate it.

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