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Harry Potter 6: Snape's Motivation Theory

Someone on my friendslist asked why Snape agreed to the Unbreakable Vow, which is a good place to start my HP Theorizing.

When Snape discovered Draco's task, let's assume he told Dumbledore. When Narcissa asked for the Unbreakable Vow, Snape agreed because he was willing to protect Draco while preventing Dumbledore's death, but he hesitated when she added the third condition: he must complete Dumbledore's murder or else die himself. Why?

Since a spy he's living a life always in jeopardy and regularly has to make life-or-death decisions in split seconds. In that second of pause, he decided that completing the Vow would accomplish three things: 1) Protect Draco from the stain of murder, 2) He would sacrifice his own life to save Albus, and 3) Eliminate all doubts to his loyalty to the Dark Lord, giving him his final and best shot to help the order.

I believe that Snape would die for Albus. (I also think he's going to die for Harry, or at least come so close that Harry learns the truth.)

However, I suspect that Dumbledore made a different plan upon hearing of the Vow. Just as he made sure Harry was willing to follow every command he gave (even to "save himself"), he made sure Snape would follow the order to kill him if he asked it. Most people think that the Horcrux potion is fatal, so Albus might have known he would die when he began to drink it, which is why he would not let Harry drink it. ("I am older, cleverer, and much less valuable.") He begged for his own death between gulps. Harry's face was full of revulsion that he was following such a horrid command. ("Kill me (with more potion).")

After Albus became deathly ill from it, Harry tried to rush him to the hospital, but Albus wanted Snape. Why?

Albus knew he was dying from the Horcrux potion and needed Snape to kill him first, releasing Snape from the the Unbreakable Vow and protecting Draco.

Snape came upon the scene, and two of the world's most powerful Legilimens had eye contact for just a moment, which is all Dumbledore needs to send the message, and he begged aloud, "Please." Snape's face was filled with revulsion that he was following such a horrid command and he kills him with the Avada Kedavra.

Oh, it gets better.

When Harry is released from the Freezing charm, he chases Snape and throws every curse he can. Snape only blocks them and yells at Harry to improve, which is what he's been trying to get Harry to understand all along. (You must be stronger if you're going to finish the work so many of us are willing to and dying for.) When Harry calls him a coward, Snape nearly chokes on his grief. Note that when a Death Eater tries the hit Harry with Cruciatus, Snape blocks it and tries the excuse that Harry is solely for the Dark Lord. Cruciatus doesn't kill, he was protecting Harry.

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I still don't know why Albus trusts Snape or why Snape would die for Albus; we only have canon to extrapolate upon. I also don't know how Draco can survive this failure unless Snape recruits him for the Light -- which would be a scene I'll loathe to love.