We should consider the guardian abilities be useable on himself and others when his/her hero mage is dead - giving them a better chance to win.
For example, warrior could be able to cast the def on himself (+4, -2 = +2)
There's a lot of spells that can reduce/remove their stats (def etc) anyway.
Agreed- the Bard and Paladin can both use their support powers on themselves, why shouldn't the Warrior also have this perk. Look for this in next version- coming very soon.