They aren't alive but that doesn't mean that they're not capable of being...guided. The frozen mannequin-like beings detect the presence of the two and suddenly blur, heads all twitching to look at them.

Then, even though it's stilted and jerky, they start to move. It's in quick jerking movements. One second they're in one place, then shifted closer by several feet, then shifted closer by another few feet, with no movements in between. Barry and Locus have the advantage of freely moving among them at a much faster speed, but they can still give chase in halting, fleeting movements.