Now correct me if I am wrong, but I seem to recall reading a codex where it says no mage has discovered how to traverse from *point A to point B* beyond using two feet like the rest of us common folks. And I don't think every maleficar in the game is 'the Flash' so barring superspeed, he's portaling or somehow slipping to the Fade. And it's already been established that takes either lots of lyrium and a group of mages or one mage sucking the life force out someone so ANOTHER mage can go into the Fade.
So, apparently all the enemy mages in Kirkwall failed to get that memo.
Or maybe Hawke was drunk/sleeping the day Daddy Hawke taught Teleportation 101.

It frustrates the heck out of me to see mages bubble up, ditching aggro. Then off my companions go after demon #6 with like 1/4th of the health bar of Apostate Maleficar Bob who stands there till the bubble drops, I redirect my companions to focus on him and Bob is suddenly 30 feet behind the combat raining that bloody circle of suck down on the group.
I'm beginning to think the talkative man is right...Maybe there is lyrium in the water supply.

Or its bongwater.

Cause either every mage in Kirkwall has this ability to portal or else Hawke is just high/drunk.