Not sure about halsey getting her arm chopped off, but the idea of her as a villain is very interesting. It's clear Jul was fighting a loosing battle on requiem, implying the UNSC has surpassed the covenant in military power. Having halsey on Juls side may just tip the balance back in his favour, as she developed quite a few of the key assets used by humanity to fight the covenant. I'm interested to see where the story will go from here. Halsey is such a complex character that you're never quite sure if she's the hero or the villain. Gameplay-wise episodes 6-10 were certainly a step up from episodes 1-5 but it was still pretty mediocre at most parts. Lots of button pressing and covie shooting ect.