Reimu chuckled a little as she watched the imp run.  It looked like it was doing all the work for her.  She tried to run after it without waking the other imps, ready to strike it down if she could catch up.  Even if the other imps woke up however, all she had to do was say this imp had killed the other one on watch and tried to rob them, and she stormed in to kill him to keep him from running away.  Hopefully that would be enough for them to let her go without a fight, but if not three on one didn't seem like bad odds.