I forgot to mention this way, way back when it came out, but that's why when he stops her sword with his hand, you just get a light "tink" noise, like tapping a glass.

He's so unable to be harmed by her that not only did he not get cut by her sword, but all the force of her swipe was also negated. He didn't bruise, he didn't even have his elbow bend from the force it. Absolutely nothing happened.

Interestingly, that means that whatever force decides what counts as 'harm' to Baldur, it immediately recognized Ana's prayer as 'not harmful' and let it through for him to decided if he wanted to take that teleport being offered to the school and make it there in a split second.

(Obviously, the answer was 'wow, a dark elf? I have to hear this story! Teleport accepted!")

--
Geoff Depew - Darth Mephron
Haberdasher to Androids, Dark Lord of Sith Tech Support.
"And Remember! Google is your Friend!!"