Drain your own figs? I do it all the time, but never see anyone else do it. Usually just to redistribute HP, especially if my opponent just nimbused. My vamps need blood! I've even killed my own guy because he was going to die from DoT next turn anyway.
'Drain your own figs' sounds way too much like a euphemism, took me a second to figure out what you meant. Yes, I've seen a lot of people use drain spells on their own models when there was no other choice. I've also seen Warriors do stuff like Vicious Thrust into a Nimbus'ed ally to avoid Blind Rage damage. Always remember that the majority of attack cards can target anyone, friend or enemy. Use it to your advantage!
Yes! I've done it twice to keep my priest alive from lava terrain. Both times it happened in a peasant game, too, haha.
