Krug Buff perpetual stun on rift scuttles

So sometimes when I solo que i get forced into playing jungle. And always go with my tried and true champ Warwick. And noticed last night as i was playing i smite cleared krugs and got the buff. And was planning to gank bot lane. It needed some time to push out so i decided to clear out scuttles and on my first hit i stunned scuttles... I also stunned him with my second hit... and my third hit. in fact i completely stun locked scuttles the entire time I killed him.

Now im not sure if this is a warwick bug or a krug buff bug because sadly the only jungle champ i have is Warwick. But ya ended up doing it probably 5 times that game. Smited krugs for buff and went and cleared scuttles stunning him every hit. It only effected scuttles just to note. But ya hes alot easier to clear when hes not running away.