Being in the presence of someone with psychotic symptoms can bring on the same feelings in the other. It's called transference, a psychoanalytic term which defines the transfer of another's distorted frame of mind onto the person with whom he is interacting.
It is subtle. That person might start to feel like the schizophrenic person feels without realizing it. If psychotic you can start feeling spacey and disoriented. If you don't know what is happening you will think it's coming from yourself.