The solution is for Bob to change Nemo's password and then (quickly) reboot the system. That would kill everyone's session and zzfart would be unable to get back on as Nemo.
I mentioned this to bob when I spoke with him........
Realist - Everybody in America is soft, and hates conflict. The cure for this, both in politics and social life, is the same -- hardihood. Give them raw truth.