I haven't read the LN, so I have no clue who the real culprit is that dumped him off the bridge, but that retard is making it pretty obvious. Nice violence, it's a good showcase that the MC and his friends are on a totally different level than his classmates, and that the demon lady is totally outclassed. Her elite minions are just goombas to them. Also, he's had petrification immunity since the beginning when he first fell into the abyss, so I'm assuming she's going to cast this on him and have it just flat-out not work at all. At least, that's what better happen, because he just sat there and let the dumb bitch finish her chant instead of shooting her.
Also, obligatory I wish the chapters were longer or came out sooner, but that's not the fault of the scanners or translators, so there's no point bitching about it.