He's in the Academy and Glaciem. His membership in the evil town overrides his membership in a neutral guild - And therefor he is already KoS per our standards. He was poking around our chat uninvited. Being an enemy, that is all it takes to be specified separately from ones town.
Our town KoS list only extends to current citizens of that town. So if a stranger leaves Erebos, they are no longer targettable by our citizens. However, if while in Erebos, that citizen does anything worthy of attention (participating in a raid, murder, theft, general rudeness) they will be specified as permanent targets, so that even if they leave the town, they will always have a special place on our wall of shame.
Needless to say, this also bars a player from ever joining Malum, or visiting as a guest.
As for the guild - nope. A guild devoted to killing mobs within the mob arena is unnecessary. the guild in question is full of player killers and undesirables. Little will be accomplished in this guild that cannot be accomplished simply by playing Herocraft.
Corwin, get with nate in-game and mug him. I also suggest you go mining rather than work on the road. You could use the experience, and will likely make more money doing so.