Sliding in here late, but Noctis will be sporting a handy dandy triple-x on his forehead thanks to murdering tons of MTs that drop over him every couple of steps or so, daemons made from humans, etc. Because of his armiger arsenal, he'd be able to keep his weapons and magic in use (and Prompto & Nyx by proxy). He'd also probably try and use one of his weapons on one of the guards and probably get himself swiftly booted to solitary confinement. But before that, he'll be rooming in a cell with Prompto and trying to think of a way to escape once he realizes they haven't cut him off from his powers.