From: KimPilgrim | #035
Bats suckerpunches Ra's, knocks him out, and locks him up. Simple.
Ra's has to die. He's clearly made out to be too powerful (and Gotham's justice system too corrupt) for "lock him up" to be the end of him.
From: DeathChicken | #036
Simple. Have Bats *try* to save him, but Ra's won't let him (He knows he'll get better, but Bats doesn't)
That doesn't work, because the AUDIENCE doesn't know about the Lazarus Pits either. Also as I believe it's been said in this topic, the Lazarus Pits won't necessarily save him from being blown up, and as far as we know the Lazarus Pits don't even EXIST in the Nolanverse. Trying to introduce them just so Batman can try to save him complicates the movie too much.
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Black Turtle spilled my diet soda!