You will be missing all the otner point of views parts, it has quite some, besides ofc shun from anime there is also from other side characters, but if you dont care about them yeah go with vol 8.
Now that we know that the big cat and the little devil cat were originally the witch cat familiars it makes me wonder, did the sheep and ox had previous masters too?.
Her time loop ability would trigger, and everything will happen again. Or wait you mean that she is dying now? if so no she isnt dying just feeling a lot of pain.
Read the chapter again, Behemot said "We do not possess here the force necessary to kill it" he is refering to Elis, so they dont have any means to beat her right now.