Retreating to fix the problem another day? What intelligent characters. I approve.
i mean, they can't really fix the problem to begin with. the monsters going nuts every time someone gets summoned means the road signs will keep getting destroyed.
there are some better ways to solve the problem, but they would take more effort.
one being to carve out the forest up to a bit beyond where the summoning circle is and set up a fort around it.
another would be to break into the castle and destroy the king's circle.
destroying the circle in the forest might work, but thats too risky as who knows what would happen to people being sent into it from the other side and if it just simply stops the circle from working people will likely just get killed off, if it doesn't, they might get shredded or stuck in some weird sub-space unable to get out.