Triple auto attacks

Ok so i've noticed this trend on a FEW mobs, I can't pin point which one exactly do this, since not all appear to do so.

I will use my most recent example, of scarlet monastery graveyard where MONKS hit me for 3x200 (all crit) and it was 2 of them doing it (also unlucky with all of them being crits) and non crits being 90-110, but always triple, each of their auto's basically damaged me 3 times, and they are independant, meaning some might be parried, or blocked, while 1 might hit.

my question is: is this a feature?

Note: Also I know the part where sometimes the game doesn't show you the numbers and suddenly shows 2-3 numbers of damage, this is not the case. http://postimg.org/image/6yv0thgrb/

As you can see that was 1 attack.

basically I got hit for 1.3k in less than 1 second, impossible to heal before getting hit again.

Not sure how it's tuned here, but the triple swing is not something that exists only here, but was also a thing on retail, it's a monster ability called Thrash, which gives mobs 2 extra swings. But I have no idea about how frequent it should be or which mobs should have it. I do know the monks in SM are supposed to have that ability.

But yeah it can be really harsh and I've noticed it's pretty bursty here.

link to the ability: http://wotlk.openwow.com/spell=3391

Hmm did not know about that...Well they do it each attack, and the only reason i even survive 1 or 2 is because of the 15% dodge change coupled with 5% of parry+block, otherwise I have no idea how I would tank it.

I guess warriors have it easier due to shield block, but damn, its hard, each single attack is that, there's no variation at all, its not a % chance, its every attack...

Yeah might do it too often than it should then ^_^.