[Rendar]

Two things.

Protect can proc for you defending an ally with Crest of Rook, who then will Crest of Rook protect you from the damage.

Which is a bit weird, but funny nonetheless.

Secondly, Protect does not actually seem to be reducing damage by 5, as it says on the tin. Instead it gives you 5 defense. Which, if you're burned, just does nothing.

[Neus]

Protect doesn't give the damage any redirected flags, correct, that's not a bug, just how it works.

The second part isn't really a bug either, it's intended to give a bonus to DEF, but the description is very outdated. It's been corrected.