User blog comment:FutureKnightX/I'm making a letter to Bushiroad/@comment-24692457-20140708052432/@comment-4844839-20140708070238

Apparently according to some judges, you can basically cast counter to respond to anything, provided that you are given a priority. I'm not sure myself. There is no mistake in Bushiroad's PDF rules though.. but they are somewhat vague.