Hm. Your writing perfectly conveys the wandering, hazy convictions of the ill - and Severus seems finally to have grasped that he is, in fact, not still at Azkaban at least. However, he is still also convinced that the world is perilous, Harry in particular. I think Harry is in for some (more) heartache.
Incidentally, somewhere you used 'experiment' when I think you meant 'experience'.