Not every defensive formation inside the city was automatic. There were many protections handled by the various factions living inside it.
Only the fortress' defenses were fully automatic. Everything else depended on how much the main world's forces had been willing to invest in protecting the dimensional crack.
Investing less would mean having full confidence in their forces. The loopholes in the city's protection depended on how much face the organizations were willing to lose.
Noah saw the shield disappearing and sprinted. Faint cracks appeared under his feet, and his figure became blurred once every few instants.
He didn't complete his technique, but there were many powerful enemies in front of him. Jumping right among them could force the dark star to push his mind even further and complete the ability that he had prepared during his travel.