How I can create SCP-173 mechanics using Blueprints?

Development Programming & Scripting
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Have a look here:

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I’m working on a UE4 horror game and got some stuff done, and what im asking is simple, but I just can’t figure out how to do it.
I’m trying to create SCP-173 (statue) mechanics. If you watch on it, it doesn’t move, but if you turn away - it moves. How I can create it using Blueprints?
Thanks.

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thank you very much