Thanks for answering these, Zen.
I really am sorry to ask again but I had to rule on this one recently and I still don't understand why cards in the Lion's army are not legal targets for redirection of the ranged attack.
My point was that I think that all units in a battle are technically legal targets for the action "Produce two consecutive Ranged 3 attacks", including cards in the army of the player performing them. Rain of Death is making the Ranged Attack but can never be opposed and therefore is not bound by the DE rulebook restriction of having to target a card opposing the card making the ranged attack (following on from the ruling that Tacticians outside the battle can perform the action).
No player is likely to choose to target his own cards with the action but if his cards were technically legal targets of the original action, one of the ranged attacks could be redirected to them by Tangen Sensei.
Is there a flaw in my reasoning?
Thanks again.