My character is currently visiting a holy place of a faction that is friendly towards me. So the character is welcome there. ... There's a faction leader here offering to teach a skill, at the cost of reputation points. It's so tempting... but I'm pretty sure that learning the skill would drop the reputation such that the character is no longer welcome. If it works the way I think it does, it would be a subtle and sneaky death-trap.
"Here friend, let me teach you the secrets of our ways...
But now that you know, we cannot let you leave here alive! GUARDS! ATTACK!"
