I see that you figured out the answer to the apparation question, from what you said in your next review. It would have drove me practically crazy too, so that's why I made sure to have a reason. As for the wand thing ... I always figured that you could not summon your wand to you. My reasoning for this is that a wand is a channel through which a wizard uses their magic, and so therefore, the wizard's magic goes through the wand and pulls an object toward the thing that the magic is emanating from - which in this case, is the wand. Therefore the wand would not work very well for summoning itself, as the magic can flow from the wand, and pull objects to the wand, but not pull itself to the wizard. I don't think it would work all that well, and only an exceptionally powerful wizard could focus their power enough to bring their wand to them. And, while Snape is powerful, I believe his talents lie mainly in the field of potions. That, and even Dumbledore seldom does wandless magic, and even so, wandless magic shows up far more in the HP movies than the books - and I nearly always go by the books. Anyway, that is my reasoning. And, yes, I know there is an occasion in Philosopher's Stone where Snape does the countercurse to stop Quirrell from jinxing Harry's broom. Lots say this is absolute proof that Snape can in fact do wandless magic. But ... I think that there is no proof that he wasn't holding his wand covertly, somewhere out of sight while muttering the countercurse, or something like that. Anyway, Thank you so much for questions! I do hope I  sufficiently explained the methods to my madness. Cheers!