I thought it was a senseless plan to begin with, and was simply respecting Elf's wishes on it. Given the authority to overrule it, I am going to do so because I think it adds nothing to the RP and I am not going to open exceptions on how to treat players for no good reason. The weight of the agreement is not on me - and if Elf did not want me to go back on it, she would've said so when she gave me this position yesterday and I mentioned my intent.
Oh, and if Kayneth can respond to someone who is exponentially more agile than him and was already tossing him around in the context of the situation zooming behind him to stab his spine, be my guest. But if he can't realistically do so, then all I have to say is deal with it. If you have no chance to respond to something another character does to begin with, then no rule is being violated.