"Who's there?"
Those three mages had the responsibility of not letting anyone leave the city alive! Any strange movements happening around the exit would be noticed by them!
Arthur had cast his invisibility spell on Laura, Jeremy, and Richard to increase their chances of surviving. As for him? He had the job of getting the attention of those mages, and start up a fight with them!
He did not use an invisibility spell with the others, as it would be impossible for them to pass through without them noticing.
The only reason for it to have a chance of working was if the mages had their focus on something else, like fighting against Arthur!
He came out from behind a house, appearing in front of the three mages who were viciously staring at him.
"Only one Official Mage? You will die here today! No one can leave this place alive!"
When Arthur appeared in front of them, they immediately waved their hands, drawing magical circles in the air, preparing their spells!