>> come down and have a conversation with me. >> while i approached, the woman that reached out for help. >> she was fine in december. >> her diagnosis. >> she tells me her sister has bipolar disaster, a severe mental illness that can cause aggressive behavior and delusions. >> when was she diagnosed? >> we started seeing radical change when she was 17 and we didn't know what was going on. >> has your sister been violent with you? >> yes, many times. >> is this what has been happening every day? >> the neighbors tell me oh, i saw your sister breaking glass right here. she's been throwing stuff...