I have seen such ability (or trigger, I don't really know) playing 2 maps: Naruto Wars Unlimited (or Naruto Shinobi Wars - these are almost the same) and Naruto vs Bleach. That was Nidaime Hokage's Ulti and Tousen's Ulti. If you don't know what I am talking about, I can say that was a totally black screen, that worked only for enemies. Do you know how to do that? It would be helpful for my map.