Pyro already deals a lot of damage. People overlook it because it’s not consistent.
If you’re able to keep the enemy still by running around it like it was done in the vid then you can pretty much top DPS everything.
Problem is… Like mentioned by @ralphdeduyo, people can ruin your DPS so fast it hurts. All they have to do is kick your fire balls away and/or move the enemy away from Fire Pillar. And Hell Breath is only decent after you spend a lot of silver to give it the lv100 damage attribute.
The guy in the vid was clearly a Pyro2/Elementalist. I think that might be the new meta after R8.



