He is 6 months old, a prime time for him to act on his instincts.
This is not a big deal, unless you do not deal with it properly.
This is common and natural. I have dealt with it MANY times.
In the mean time, separate him somewhere safe,or supervise interactions with him.
Please read this enlightening article on roo behavior:
After realizing the need for clarity, I decided to create an article for those of you who have roos with behavior issues, those thinking about adding one to your flock, or if you are just curious since the issue is natural to come up for each of us in even the most docile of males. It is...
please share.