Saw the 1948 adaptation of Hamlet, can someone explain to me why this scene felt unsetting?

I don’t know why, but this really unnerved me. That’s probably not what they intended, my nerves said something differently. Can someone explain to me why this is???

I don’t know why, but this really unnerved me. That’s probably not what they intended, my nerves said something differently. Can someone explain to me why this is???