All enemies contribute to the timer, I know in my case I am much more effective taking on packs as opposed to individuals or strays hence why I was kiting around all over the place.
I think we ran pretty good last night though some packs and RGs were WTF!!
Same for me with my FC barb the small groups just are not worth it... Also running with you I've been thinking of not using WCry and changing it to HOTA/Smash because I always seem to be running off you WCry anyway.