I know this is a Foggy!whump/Matt!whump via Foggy!whump prompt but also think of the possibilities of Matt's experiences independently of what he would find out? How does he experience the thing there? Does he 'see' just like he does outside with his radar? Is it more like a dream he might have with vague shapes and blurred colours? Does he actually see because this is Foggy's mind and Foggy can see?
How are his other senses? Is his body/mind outside still conscious so that he is in Foggy's mind but can also hear the couple arguing two blocks away? Or would he experience relative silence for the first time in ages?