Quick question about tempest

By Oncus, in Descent: Journeys in the Dark

Card:

http://descent2e.wikia.com/wiki/Tempest

So, if the hero has no fatigue tokens, and uses the skill then fails, is he left with one fatigue token? Or 2?

I'm guessing the skill cost is pain upfront, so you recover half of the cost if you fail, right?

So, if the hero has no fatigue tokens, and uses the skill then fails, is he left with one fatigue token?

yes.

Another question regarding the spiritspeaker skill http://descent2e.wikia.com/wiki/Drain_Spirit

If a hero close to you is KO, does using drain spirit revive him? If so, it seems the KO hero doesn' have a choice and must get up with only 1 hp, is this true?

Correct!

yup

You could choose to have NO ONE recover health, or everyone recover health, but a particular hero could not say "nah, I'm good." If you are healing no one, not much point in drain spirit.