Cortana is definitely doing the right thing. Restoring forced order is still order. I played the game and was constantly frustrated I couldn't be on Cortana's side. The most unbelievable thing was the Domain existing (which was destroyed with the activation of the Halos, as it was a Precursor technology, and as such, was completely and irreversibly destroyed when the Halos fired. Also unbelievable is that humanity is millions of years behind forerunner tech, yet still manages to kill even one promethean. Forerunners are literally so far ahead I fully expect a single promethean to be able to take on at least 15 or 16 scorpion tanks supported by at least 10 pelicans at once without even losing 30% of his shields. I mean they built buildings which could go under the crust of a planet and come out the other end and ships which haven't collected a single iota of rust or damage in millenia of landslides and whatnot. I mean according to the books, Master Chief's armor was 6 times weaker than the minimum recommended skin to deal with flood, and that's assuming that's like what they wore to take a shower, much less full combat armor, which potentially was thousands of times more durable and effective than Mjolnir. Also, how is Johns team alive? They died.