in addition to some other curious rules of movement that i have come to place upon myself, one of the things i take great care of is not to point swords blades or almost any sort of pointy thing at another person.
there is no fixed reason for this. basically, it symbolizes great care and respect for the other. secondly, pointing a sword at someone may be something bad or maybe good. and because i cannot be sure i avoid it. if i feel like i am ready to influence something for the better as training or exchange, then i am free to do whatever to communicate my understanding as best i can.
it takes great care and skill to be so careful all the time. sometimes, one cannot avoid or control so one needs to be flexible and read things intuitively not necessarily superstitiously.
j