Do you have a favorite Harry Potter theory or head cannon? I think mine is the theory that even though his wand was broken and he was expelled, Hagrid continued to learn magic with Dumbledore's help (a theory I found on youtube).
((OOC: I actually reblogged the post with my new favourite theory, as it happens- The theory that, at the time that he was alive, Salazar Slytherin was not actually a huge fanatic, snootily denying that students from muggle families were unworthy of going to Hogwarts.
He was a Viking, a man of a different lifestyle and spiritual path, living at a time of religious persecution when the oncoming Christian tide was looking to purge all non-believers.
He was living in a time where all the muggles around him were converts, and where any time something bad happened, witchcraft was blamed, and a new victim was thrown onto the pyre.
As such, he was exercising extreme caution in an attempt to protect himself, the school, and his friends/co-founders, the three places where he placed his loyalty. But his friends were unwilling to keep out muggleborns for various reasons, so, in an attempt to protect his friends and those in his care in case the worst should happen, he built a big panic room/bomb shelter in the basement, and smuggled in a creature he felt an affinity with, who he could communicate with, and who could easily take out anyone laying siege to the school.
But as the years passed and the threat died down, the societal prejudices in the wizarding world took on a new edge, and those looking for an icon, a symbol to use as a shield in their campaigns, put Salazar on a pedestal and twisted his words to suit their purposes. A bit like the present-day religious extremists who use Jesus as a figure and an excuse as they spread messages of hate, when Jesus, if he existed, preached nothing but love and acceptance.
I just really dig that. I dig the way that history supports that theory, and I dig the idea of this big broody Viking man trying to play mother to his three idiot friends who were out to get themselves killed through reckless behaviour and being FAR too quick to trust.))