From a bombardment that was ordered to wipe the city off the face of the planet? Horus wanted it bombed so thoroughly that the defences that protected them from the life eater virus wouldn't even be effective. And somehow, a building, that's collapsed, and not even covering Loken from the outside, as he can see the bombardment starting. Protects him.
What utter bullshit. Again. Loken lived, therefore I am fully expecting them to pull Tarvitz and Vipus back in, they'll probably join Malcadors Knights as well.