funnily enough, there is actually a note on Akio Takami's Wiki page for this episode: レンの突撃に応戦するシスカとローウェン

the description is... pretty vague, but it might be possible this is one of his parts. there's also a scene before this thats not uploaded that could be him.

so for now i'll untag Oka. ive also taken the extra step of presuming everything else on this episode until i come to a conclusion on what this note is referring to