He did not understand
Mayeux was about to persuade Aeryon to abandon this idea of moving north when the west is not yet decided but when Aeryon said Wustkazan suddenly Mayeux stopped.
Mayeux seem to be thinking of something. It is not that they did not have a northern plan. It is just that at the time when they were formulating the plan, the forces in the north are not simple
But when Aeryon said that he wanted to attack Wustkazan, Mayeux first instinct was to say that Aeryon is confused but then he thought to himself how could Aeryon forget the complicated forces and dynamic of the tribes in the north
And it is only then that he remembers something. There is something that has changed in the north.
And it is a big change. And suddenly everything clicked at once.
" Forcing Utgard to clarify their stance!" he exclaims as he look at Aeryon with a smile