Well in FFXI it was entirely possible for smart DPS to rip emnity off the tank when ever they wanted to. In fact for a bit it was a frequently used mechanic in exp parties using a traditional party format as it usually involved a second DPS stacking sneak and trick attack to land a heavy hit that the tank would effectively be blamed for. However I found out around when the treasures of aht urhgan that it was also possible in that game for a DPS to literally break the emnity mechanic during a fight when I closed a lv 3 skill chain using my relic scythe on one of those HNM mummies for something like 17K damage setting off an unresisted skill chain effect for over 30K additional damage. At which point even the PLD using their 2H ability which should always place them at the top of the emnity chart failed to pull it off me.