I'd want Shane to die, but I completely understand why he did it.
It was either they both go down, or one of them survive and get the stuff back to Carl to save his life as they wanted. And since Otis made it obvious he wouldn't go without him, Shane made the decision to leave him to die to save Carl. Really, it's pretty easy to see why Shane did it. It's cold as hell, but it's better than the alternative of a wasted trip where both of them die.
Shane is my number two favorite on the show now.
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Xbox GT: PrivateBiscuit1
Down with Zhang. Let there be Biscuit!