I used to do that and got ok to crap results thinking that was as good as it got. I did it to a guys stone without realising what it can do one time. It causes stars in your eyes apparently. That was from the other stone bouncing off the back of my head - the circular motion can cause uneven wear on the stone apparently which requires the stone's surface to be leveled again to make it useable for other techniques. Every time I use a stone now I get that uneasy feeling and still don't use circular motions. It was a true learning opportunity haha.
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