Why should the light magic be damned? Why isn't it valid for Zelda to use her prowess to save Link from being killed by a guardian?
As for the rest of your ranting, here's what I have to say. From the relatively few scenes and lines we have from the game, it is my opinion that we have as much...
Wow, okay. So when Zelda saves Link's life it's not that big of a deal, but when Link stands in front of Zelda to defend her it's because she's weak and useless. When Link's mouth is open it's a reasonable reaction to a perceived threat, but when Zelda's mouth is open with something threatening...
Yes, you are biased, apparently.
Having her mouth open when seeming surprised is not indicative of her being a useless or powerless character. If you've been paying attention you'd have seen the scenes in the trailer of her saving Link, or taking care of business without Link around, and...
Can't tell if you're joking about the second set of eyebrows, but the lower ones are shadows at the top of her eyelids. The low contrast of the art style makes it harder to see that. And as far as the mouth being open, this is a screengrab of an action scene. It wasn't designed to be a stillshot.