i second what ruth said. My roo started doing that after a time he half hearted tried to assert his dominance with me and I promptly grabbed him and asserted my dominance in such a way that he has never tried it again and shows full respect for me at all times. In my ignorance, I may have over asserted. Since then, when I come in the pen, sometimes the back side of his comb goes greyish, sometimes the tips go black, but in fifteen minutes later it is comb color. He might give a hen the eye, and I will sorta give him the signal with a shoulder move or slowly wave an arm and he is off of that thought immediately, but his comb will purple up again. It only happens with the two roos that had to go behind the woodshed for a little tutoring. I can't imagine you would have to do that with a serama, but anyhow, that is my two cents worth.
