Still Standing in the Fire

I got killed by Fyrakk's Shadowflame aura when he flew past the assault camp, but I did not receive the achievement.

I am going to make it simple in case you missed it in any of the previous posts...

IF... You are trying to get this achievement while at the weekly chest/disciple raid. You will not get it.
He gets to the open world raid/event area or close... You will not get it.

to get it,

1. You should see a bar for Fyrakk's ticked off meter. when it hits 90-95ish% , get naked. and go to the other end of the zone. not all the way, but close. (usually it will be west)

2. at 100% he will shout some threats, Open your world map and look at the zone your in. You should see a fiery dragon figure appear and move slowly towards the event area.

3. Fly towards him and when you see him land in his path. When he flies over you will see pink/orange fire spots burning. go stand in one.

Now.. release and get some clothes on

How often does the dragon appear?