1.Drain Life - Just in general how does this work, is it a single target move or a buff that lasts over time? Also, if it is timed, how long does it last for?

2.I know that fire storm combos with ice storm, however does lightning combo with ice storm? Also, how much more damage does a "combo" add. If lightning does not combo with ice, does that mean if I were to only choose one of the area spells, fire storm > lightning?

3.When I freeze a creature, if my friend or I is using a bow, will that person be unfrozen from the arrow hit?

Thanks!