The Walpurgis was approaching, and the troops of Benimaru fought in Eurazania against the Claiman army. You knew you weren't fit to fight, but you still wanted to do something, anything to help. But no. Rimuru ordered you to stay in Tempest along with the other citizens, according to him so that you wouldn't be in danger.

Right now you are trying to insist that he at least let you accompany him to Walpurgis.

"No, don't insist. I already told you that you will be safer here, you won't go."