I believe it’s high time I added some comments to my own question, as I posed it exactly a fortnight ago. I apologize for the absence, but Muggle life can be sometimes rather tiring, and when combined with the finishing exam period it’s even more so.
As for your answer to the question,
Witherwings, it makes perfect sense to me. Actually, it seems that you write your answer in the
very same fashion the ideas were running through Draco’s head - very quickly, one succeeding another. And I most agree with you on the points you make.
Hi,
Laura! It’s nice seeing you around.

Well, I decided to first-post here a short while ago, too. And welcome to
lianne_nakago!
xdarkserpentx, your answer was much organized, don’t worry.
I don’t think I have much to add to what the rest of you have said on the issue of Draco’s thoughts, but what caught my attention is the following in xdarkserpentx's post,
QUOTE
So that goes back to what I was saying in the previous paragraph, would he [Draco] have accepted the protection?
That’s an interesting point. And I think Draco
would have done so. I know that, like it has been pointed out, the only evidence we have is “His month was open, his wand hand still trembling. Harry thought he saw it drop by a fraction.” Yet, I think the drop-by-a-fraction bit is enough of evidence about Draco’s intentions of accepting Dumbledore's offer. I’m convinced that it if Draco was a cold-blooded murderer, whom he isn't, he would have killed Dumbledore the instant he reached the top of the Astronomy Tower. But the long time he spent talking to Dumbledore only proves that he got cold feet in the end and would greatly accept and appreciate the offered help. I’m not saying Draco is a coward, well maybe a little, I’m saying that there was enough good in him to restrain him from the murderous act and should he have more time to make the decision, he and his family would have certainly ended up under the protective wings of the Order.
Great question, Marcey!
What do you think Draco was thinking when Snape killed DD instead of him doing the deed? And what was Draco thinking as he and Snape took off on the run?Like it’s been already said, Draco must have been both relieved and scared to death. The relief was the the primary emotion. The deed was done and it wasn’t done by his hand. But this was very closely followed by fright that it wasn’t
him who killed Dumbledore and thus probably he would have to face retributions from the Dark Lord himself. And though I think he was afraid for himself, he might have been even more so for the safety of his mother.
And then, I believe when they were running with Severus to the Hogwarts gates, I believe another idea dawned on Draco. The scariest yet. He might have believed before that Severus was on the good side and thus Draco might have cherished, maybe only subconsciously, the idea that if everything failed Severus would save him. If Draco thought, at least for the tiniest of whiles, that Severus was on Dumbledore’s side he might have laid his hopes in Severus that this one would offer help if need be. But when Draco saw that the wand casting the killing curse was Severus’s, he realized that Severus was bad after all and all Draco’s hopes for any salvation must have failed at that moment. And this I believe must have scared him the most. The idea that no help would come from Severus as this one was "indeed" on the Dark Lord’s side.
Laura,
QUOTE
As they were running off, I'm sure he was still trying to process the idea that DD was actually dead.
And I would only add that it takes pretty long for any idea like that to sink in, so I think Draco was actually processing it for a rather long time. I’m actually wondering
when he fully realized what he’d done. That it was
him who let the Death Eaters to the school and thus he was partly responsible for Dumbledore’s death. And whether he felt any remorse upon realizing this.
Witherwings,
QUOTE
I think it might have been possible for him to realize how close Snape was to DD even if he 'was' on Voldemort's side.
Indeed, I believe that Draco had his hunch. Because when we get to “Prince’s Tale” and Severus and Dumbledore are discussing possible ways of getting to Draco, Severus admits to the fact that Draco doesn’t want to let Severus help him. Draco supposedly argues by the fact that it was because of Severus that his father was in Azkaban. But I believe Draco might have suspected that the relationship between Severus and Dumbledore might have been closer than they revealed on the outside. And thus he was primarily afraid that Severus would try, on Dumbledore’s order, to prevent Draco from accomplishing the deed, thus throwing him and his family into the deadly danger.
Keep posting your answers, guys! I so much enjoy reading them.

~Jana