The interactions between hallucinations and reality in people with schizophrenia
Unfortunately hallucinations of visual type seldom occur with schizophrenia. When visual hallucinations occur in schizophrenia or more frequently (but still uncommon) in other disorders they are rather unlike a simulation of the current world - e.g. a closed door becoming open in the room. In addition patient in a hallucinatory state is very affectively taken by the experience and often is just afraid to move. Further - the only way to know would be to ask the patient as to what happened, but given that this kind of event is very rarely, if at all, happening, there is no answer because - how can you set up an experiment. Therefore this question, interesting though it may be, is just of speculative value.

A good article about the topic is:  

M Manford  F Andermann, Complex visual hallucinations. Clinical and neurobiological insights. Brain, Volume 121, Issue 10, 1 October 1998, Pages 1819–1840