Angel has obviously been watching old Harrison Ford movies, they're infiltrating his mind. "Wood. Why did it have to be wood." And then the pressing stones in the right order, and the big pedastel the sword was sitting on.
Wow wow wow wow. And now we get Angelus too, the best bad guy ever. David Boreanaz does crazy so well it's frightening.
About halfway through, I was thinking, maybe the spell worked, and Angelus is just screwing with them so he can get the sword and then go join his buddy the 8 foot magma demon. But no. So by the end, I was totally fooled.