Create a Boolean attribute called Movable. Then create a rule. When Game.an attribute is 3, then change attribute Moveable to false. In your actor create a rule: When attribute Movable is true: here, put all your motion rules and behaviors. Now when Game.an Attribute is 3, your actor will not move or do anything.
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So what you want to do is have all your move rules and everything in a rule when attribute does not equal 3
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