Arthur had one spell called Shape-shifting. He did not use it very often, only in specific situations, as it was a spell meant only for hiding, and did not increase his battle prowess.
Now, for the type of mission he was currently in, it was a blessing.
He cast the spell, turning into a common rat, just like the ones they had seen in the sewer a few moments ago, and walked out using the nearby exit.
The first thing he did when getting out of it was to gaze at all sides, looking for any enemies that could be around, waiting to kill him.
It was an empty street, and the reason for the place to be so quiet was because the sewer exit led directly to an alley. In Arthur's opinion, that was the best place he could ever hope for.
Arthur walked through the alley with his small body rat to make sure there was nothing there, and when he was certain the place was clean, he returned to meet with his squad.