Re: Safety amongs beginners
I also feel that it is completely ok to refuse to train with somebody who, even if it is not malicious, has such little body control that you fear injury.
I know "how to do so" nicely can be a challenge. On the rare ocasion this has come up for me, I smile regretfully, shake my head, and if necessary sit down as if sitting out the technique, then find another partner or work into another pair. If I have to say something, it takes the form of blaming myself: I'm afraid I just can't keep up with your strength/energy.