After the unforgiveable

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This fan art appeals to me because it freezes the exact nanosecond after Snape kills DD. It is my firm belief that DD and Snape had a plan. (and this would be what I am taking to Phoenix) JKR would not have us know that DD and Snape are both accomplished occulmens and then have the pause. That second where "Snape gazed for a moment at Dumbledore, and there was revulsion and hatred etched in the harsh lines of his face." (HBP American ed pg 595) I am not saying DD is still alive. I am saying that this was staged. With the "Severus please..." I am sure that Snape was hesitating and DD had to remind him. I don't think Snape wanted to kill DD. I believe he was under orders to kill him. So that Harry would have enough balls to finish the quest alone. Snape then disappears running off with Snotface (er I mean Draco) even Buckbeak joins in the play acting only screaming and chasing..NOT tearing flesh from bone as he easily could have. Look at the art again--he is so sad. My poor darling having to axe his mentor. painful. Consider again the text-- revulsion and hatred. You can certainly be repulsed by something you have to do (anybody changed a diaper lately?) and why not hatred when you are faced with such a hideous task?
My Snape is innocent.