Lat year when our roo started doing "the dance" my daughter and I thought it was the funniest thing. What I have learned since is that it is his way of asserting his dominance over the flock which he thinks includes you. This can be a problem long term because it eventually turns into more dominant/aggressive roo behavior including attacks. If you want him to remain a "nice" roo, you should assert your dominance over him. let him know you are the leader of the flock, not him (assertive not aggressive). This issue has been discussed many times in this forum. I am not sure how to find the information on this specific topic, but it has been very enlightening. I only wish I had the information earlier because we may have been able to keep our roo. He eventually became aggressive and would ambush the kids.