1. Only characters can't be protected from themselves, so you can stop writ by protecting itself (this is why the latest ANB combo worked, ANB could be protected from removing itself because it was just an enhancement not a character).
2. I believe if you you remove all cards from battle, but the angel is protected, WWW goes, since it doesn't get the protection. If the angel is captured, the placed card is discarded.
3. no.