I was surprised to see the looking for raid queue pop up as quickly as it did, but after the first attempt on the boss I understood why, apparently they had been trying for a few times before I got in and some people left while new ones joined straight after, me being one of them.
Here in this video you can see the 2 attempts on the boss before the kill on the 3rd one. Unfortunately I was trying to cheat the Damage meters in the last one by killing some adds on the sides but was not aware of the sudden misfortune that was awaiting me when I attempted to do so.
Hope you enjoy spectating it as much as I did in the last attempt.
There is a nice cinematic at the end after the boss kill too.