If he's suicidal, he could become homicidal. The first time my family experienced a manic psychological break from a cousin we just stayed in the house with him after a brief psych hospital stay. He then had some sort of further hallucinatory break and he was racing around the house -- literally like a mad man... very heart breaking... We called the cops and had him committed as we really could not take care of him at all and him running around like a crazy man could get _him_ shot by the cops. After he got help, was diagnosed bipolar, and was on his meds, he told us what his hallucinations were and the story in his head was that we were threatening his family -- that will turn most men homicidal, so we were very lucky.