When loaded TorBlock loads up the TOR master IP list from http://belegost.mit.edu/tor/status/authority, and will from then on disconnect all users from any of those IP addresses. the TOR network is not intended for game play use and is generally only used in BZFlag for Server Spamming or other disruptive effects. TorBlock will automatically update it's ban list every hour with new IPs. TorBlock works independently of the built in Banfile capability of BZFS so it will automatically allow users from blocked IPs as soon as they are removed from the TOR master list.
TorBlock was the first plug-in to do a dynamic ban feature that pulled from a central web repository. It was made in responce to a Tor Based attack on the popular game servers.