Takeshi's expression changes to one of shock as he takes a step back. "Why would you even consider that?!" He shakes his head, trying to adequately answer the question. "Well, the answer is yes, but I have no idea why you would WANT to do that. Mediators don't really do much other than help us out, and they'll do so regardless of your faction. I suppose you could break contract, but it's likely that, depending on what, exactly, you did to break it, you would be attacked on sight by other magical people. Mediators are good at evading conflict but they're actually less physically powerful than the average human; it'd be like killing a child." Takeshi takes a deep breath.
"As for the second part, the purpose of the contracts is to ensure the safety of the Mediator. Some of them have added stipulations and benefits to them, but that's usually the main point." Takeshi looks around. "Anyone have a less horrifying question?"