Kai shifted his weight and scanned the perimeter of their group and noticed the shifting shadows in the trees. 
His ring glowed blue and two of his throwing knives appeared in time for him to throw them at the two jumping imps coming out of the tree line. 
As those two dropped, two more took their place. 
"You know, I have a test tomorrow," he grumbled and backed up half a step to keep the shadows in his sights.