Scene Capture 2D Mirror

Hello guys. In the project, I use a mirror made with Scene Capture 2D. It’s ok, but I want to make sure that when the player looks at the mirror, it shows the reflection as it should, but when the player stops doing this, the mirror would display the last frame before the player stopped looking at it or just stopped reflecting.

I was able to realize only a part - when the player looks in the direction of the mirror, the brunch gives out the truth, and in a situation where he does not look it gives out a lie. But beyond that I could not do it - either the mirror constantly betrayed the truth and reflected, or it stopped working.

Could you help me with this question?