After the first circle how do you know who is parrying who?After the first circle you are helping the opponent target yourself straight down the middle so to speak.If you are parrying in this fashion of circling the tip of the opponents bo what is to keep him from striking you with the other end?This is if it is bo against bo.If it is your bo against a set of sai or tonfa for example your bo is occupied while your opponent is free to attack with the second weapon.If you practice weapons kumite you will see how fast things happen,this circling is not likely to happen with a desired outcome.
Pretty for show but not effective technique.
Tom Hodges
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Thomas Hodges, train 100 practice 1000