How can you save someone who may have the prodromal phase of schizophrenia?

First assess! Many disorders, from pervasive developmental disorder to depression to personality disorder may suggest early schizophrenia, so a thorough evaluation, possibly including sophisticated tests for biological markers associated with schizophrenia, should be the first stop. If there is a prodrome, start with cognitive behavioral therapy, add fish oil, and consider antipsychotics.
Early treatment. Makes big difference in eventual prognosis.