Perma cc requires you to use one cc ability per turn and keep attacking the targets for tons of ap, which is fine. This combo just instantly kills the target once it is on low/no armor for the cost of 4ap total.
You shouldn't be able to kill a boss on tactician mode in one turn, there should at least be a maximum damage per turn on rupture tendons or something like that. When we fought this boss we were under leveled/geared even.
