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Start playing an animation montage on the avatar actor and wait for it to finish If StopWhenAbilityEnds is true, this montage will be aborted if the ability ends normally. It is always stopped when the ability is explicitly cancelled. On normal execution, OnBlendOut is called when the montage is blending out, and OnCompleted when it is completely done playing OnInterrupted is called if another montage overwrites this, and OnCancelled is called if the ability or task is cancelled