While Katrina was going berserk up above, Karl had quietly infiltrated the barracks using a sleeping spell and wiped out all the off duty guards, including two of the Immortals, who were focused on their cultivation and failed to notice his approach until it was too late.
Things just couldn't stay that smooth for long though, and the alarms must have been raised because moments after he eliminated the second Immortal, and the last he could sense in the area, a number of transfer spells attempted to activate. Karl worked quickly to bend their arrival location down into the ground, killing the arriving reinforcements on arrival.
He's about to warn Kat when he feels a much larger portal open, one that will stay open and let many cultivators through in a few seconds. The air twists with the surge of energy from the large portal opening just as the unmistakable bark of a heavy machine gun starts in the courtyard.
