Constructive?? From me??? Are you kidding?
Well as we see from the video thay have healer(s) on the imp tanks. If the agro swapping works as it should I think it should be possible to tank the imp for a long time so it might be partly about luck. The other thing I notice is that they have at least a conq as one of the imp tanks and that they dont seem to have that good gear on them.