Air Blast bugged (skill 3 flamethrower)
It’s not a bug.
This skill extends burning by 2 seconds on foes already on fire.
http://wiki.guildwars2.com/wiki/Air_Blast
Ok, thanks for the answer.
It’s not clear on the tool tip in game.
A good skill to test how “good” the new skill tooltips are in the Oct 15 patch.