Ok, the comments here say that the manga makes the classmates hate him less and I love it because it's so much more realistic! The light novel may have the classmates be total bitches but here they're not and it makes sense because they shouldn't past a certain level. Also, the art here in this manga is very top tier, it's so enjoyable.
@stantheman except the part that anime used too many CG, i think this scene is better in anime.
I mean.... starting calm, then a monster showed up and show their speed, killed by that bear-thing, the MC ran from that bear for short distance then lose his arm.
TLDR: The anime depict his terrified expression before lose his arm better, while the manga rushed it.