In act 2 of Diablo III there are vulture-like monsters that circle in the air around the hero until they spot a "weakness", and then they swoop down to attack. What is the definition of "weakness", and is there anything I can do to force them down earlier, when I'm not at a disadvantage?
In my experience, the "moment of weakness" is when one of the following applies:
If you have some way of damaging yourself in a controlled setting - e.g. by activating a weak trap - it might be a relatively safe way of getting them down.
However, they also swoop down if you just let some time pass, so if you have the patience and don't want to be attacked at a disadvantage, just wait it out.