It's quite different from the WN version (maybe it got revised on LN version).
In WN, after defeating Vine Puppeteer, there's no scene about Sophie straightly died in that place (we didn't know she's really died here or not). The girl in the end of ch who has a big shield, is leader of Guild Saber named Seraphina. Her interaction with Atobe is just giving warning to prioritize his party safety rather than trying to fight back, yeah just that. Guild Saber is something like "rescue squad" and mostly handle missing party or dangered party inside dungeons. She giving Atobe warning because his action as party leader can bring more casualties. In the end, she still thanked for carried their mission on behalf.