"Not really. There are rules about duels, but not for spars. For example, if this were a duel, we would have to be supervised by a sentry because I am not of age yet, and there would be formalities such as greeting bows and explanations of why the two people are having a duel in the first place. Duels are not training though, they are meant to be a way for two people to solve a problem between themselves, while spars are simple training." Onyx realized she may be over explaining so she kept the rest short. 

"The only 'rule' for sparring is that you are not allowed to seriously harm the others involved on purpose. Most spars start informally in a pre-set situation, as if one person is already in a corner, so to say." Onyx thought for a moment to try and remember if there was anything else important to say. "Oh! I almost forgot, if you are stuck in a situation where you are unable to speak, we recognize three taps anywhere on the other's body as surrender and you'll be released immediately."