Merlin's Left What? / Hogwarts Transportation Security / One More Curse

[Carol]

bboyminn wrote:
> <snip> As to the Floo network, while we see Floo communication can occur, we never see Floo travel without Dumbledore creating an exception. Likely to keep the students under control, travel by Floo is generally blocked, but communication by Floo is allowed. 

Carol responds:
Unless you count Snape's summoning Lupin to his office via the fireplace and Lupin arriving by Floo. But I agree that we never see travel into or out of Hogwarts by Floo except for the "one off" arrangement in, IIRC, HBP, and in OoP even communication by Floo is monitored and Sirius Black is nearly caught.

Blocking travel by Floo would do more than help to keep the students under control. It would help to keep out intruders (Sirius Black in PoA, DEs from OoP onward).

Carol, wondering about all those magical protective enchantments that Snape mentioned in OoP and why they so dramatically failed in DH