In several areas of Act 2 (Desolate Sands comes to mind) there are flying enemies that seem to circle above and swarm just out of reach before dropping into battle.
I've tried throwing the skills I have on my build at them, to no effect. I have to wait for them to descend if I want to do damage. If there's other enemies in the area, they tend to follow me and attack at inopportune times.
Are there any skills that can injure these type of enemies before they descend?