Depends on mob speed and model size. If you manage to sprint circles around the mob pack it could be they never get a hit during your sprint duration. But not all mobs behave like that.
Some people do it even with one mob and just spin it closely around or within the hitbox and won't get attacked much.

I would only use it as a strat if you don't have any cooldowns left and are barely staying alive while your healer pumps out everything. Your dps aoe and melee have easier timer to hit everything if its stacked, so you running around in circles has a detrimental effect on clearspeed, it just makes you get hit less.