ok up until recently, i had been refreshing howling blast on the last tick of my disease to not miss glacier rot on it, but after recently trying an obliterate instead...followed by dumping with subsequent frost strikes, i didn't notice a drop in frost strikess damage, or the following howling blast's.
Therefore, i reread the tooltip, and figured it must be because of the additional death knights in the group. the tooltip reads that the buff is applied when attacking "diseased enemies." so what i figured is that they don't have to be my diseases. why this is hard for me to test is because i need another dk, and i'd rather just ask here than waste time. before i do additional tests, can anyone save me time and confirm that glacier rot buff works towards enemies diseased by a different DK?