So in the end Louis didn't manage to get the plot armour which is cool because it shows the manga's willingness to utilize permanent consequences. As for the rolling thing before it turned into the world eater snake, I doubt there won't be civilian casualties. This is definitely his biggest trial to date, one that he may not be able to solve solo and in need of help from other capable adventurers like his previous party.
I don't see it happening in this arc but I'm hopeful there'd be a reunion between him and his friends soon.
Will do ANYTHING for a cup of COFFEE