We're making him an offer he can't refuse. Either stay and be killed or captured, thus solving a problem for old man Sistani OR flee to Iran to become yet another marginal exile, leaving the lion's share of influence in Shi'a Land to, you guessed it, old man Sistani.
Guess who we have a secret agreement with?
You guessed it. Old Man Sistani.
Guess whose stooges and toadies are going to win the upcoming "Mosque Election" in the fall?
If I said, "Old Man Sistani", you'd have reason to kill me, but I'm a nice guy, so I won't say, "Old Man Sistani"...
BTW, did I mention that Sistani is getting on in years?
Be Seeing You,
Chris