You are correct Jo, I ask myself that question also. On A trains, I have to often switch to heals and spam an invisible boss to get credit, hoping that the tank(s) get enough agro to make it a full one. S ranks, I never have an issue. Also, I have Spectrum's highest internet speed and my connection is always excellent. Due to SE's unwillingness to accomodate A ranks with decent rendering, I would like to see the "get a hit, get full credit" like S ranks have.