Also the cite got siegfried's AoF wrong.
All A-rank attacks are effectively reduced to E-rank attacks, meaning even qualifying blows directed towards vital points are rendered as minor scratches that can be healed by his
Master at a quick rate.
[6]
[3] When facing Noble Phantasms, it gains defensive values equivalent to B+ rank, but the boost will not apply in the attack calculations if the attack is not used by a proper hero or the attack or
Skill is imbued with the properties of "
Anti-Drago".
[6]
[1] Furthermore, given a case where he receives a blow while in a state of being purely "
defenseless", defensive values also becomes equivalent to B+ rank. And in the case where he takes defensive action with
Balmung to match the opponent's Noble Phantasm, the properties of the opposing enemy's Noble Phantasm will be further reduced.
[6] Due to this Noble Phantasm, his
Magic Resistance Skill has been lost.
[1]
This was ripped from the wiki, so there is no reduction on AoF if he takes a defensive action, but the opposing enemy's attack will be further reduced, I'd give it like a B++ since Natsu Meets the dragon requirement and if siegfried bothers to block any of his attacks with balmung.