Glen isn't going to preemptively kill Merle because of his friendship with Darryl. If it had been any other stranger, Glen would have no problem shooting him - but how do you go back to camp and say, "Oh hey Darryl, shot your brother today."
And I don't think Andrea automatically sides up with Ricks camp, even if she sees Glen bloodied. She might hold a little grudge for being left behind, plus - she thinks with her ovaries.
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What am I even doing here?
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