Reimu smiled at all the sleeping imps, glad that there didn't seem to be any awake.  No matter which way she went, getting rid of the imps now meant not having to deal with them later, and with them asleep, it should be easy enough.  As silently as she could, she crept over to the nearest imp.  If none of them woke up, she would stab the imp in the chest with her spear, hoping to kill it before it could wake up and sound any sort of alarm.  She planned to continue this, killing as many as she could before any realized what was going on.