Snape's Secret

I was thinking about this just now (in the shower, if you must know ... which is actually a rather productive place to think and ponder.) Even before they see the dark mark in the sky, Dumbledore is pretty bent on seeing Snape. Why? I had the feeling then and have it more strongly since I accepted the possibility of the "good Snape" theory being right. There was something in that potion that he drank, something that revealed a key element about Voldy's personality, motives - something that gave a sharp mind like Dumbledore's a very important clue (personally, from the comments Dumbledore makes while drinking the potion, I think it makes the drinker relive/very empathetically watch the torture of the two children by young Tom that occurred in the cave.) So ... too bad he died before he could pass that on to Harry, or to anyone for that matter, eh? I think he passed it on to Snape via legilemency. This of course would mean that in book 7 Harry will need to (horror of horrors to him) actually talk to Snape (not yell, not fight, not accuse, not belittle, not curse ... talk). This would be one possible reason for the clear revulsion and hatred in Snape's face. If I am right about this I would imagine that the communication is very much along the lines of what I was saying in the post on imagination ... very quick, maybe images but also an immediate and impactful conveyance of implications and ramifications ... a full communications of the minute details and the "big picture" all at once. (That combined with a statement of "you see? that thing we were talking about (that Hagrid overheard), that you have been getting increasingly agitated about ... pulling the stopper in such a way that it propels you as close to Voldy as anyone can be because you seem to have murdered me ... this is it, now is the time.")