That's why I'm asking, I've checked every source on her page and there is absolutely nothing supporting her feather bullets being even remotely close to that powerful.
Literally first few sentances of abilities. A servant with mag res doesnt have to guard against simple magecraft like that. Forcing a servant w/ mag res to guard as a modern magus is a big deal
And where does this forced defense occur? Because if it's from the OVA that's just wrong, he isn't forced to defend himself, he swats the feathers aside without them doing anything. So where is it stated in this novel you mention that they were a threat to him? Because the OVA shows and the Script from Materials very much confirms the feathers as a complete nonissue.
This wiki is not a source, it is a collection of information from sources gathered by people, and the people who write articles can very much misread, misinterperate, misremember, or otherwise be wrong. So what is the source on this feat?