It’s not a hologram. It’s an animatronic.
Those barriers are for maintenance like when the animatronic is malfunctioning. If it happens during operating hours, what they’ll do is shut the line down for a short time, wheel out these barriers, then reopen.
The “holograms” could perhaps be the “science” projects in the lab room or maybe some of the animal projections on the river ride (or something else entirely new.)
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