Low Focus! (Setting up a new trigger in MSBT)

One of my new babies is a draenei hunter (level 53 already!!!) and I found myself wanting an audible alert for low focus. I knew I could probably do it in Power Auras but I thought it might be nice to set it up in MikScrollingBattleText instead, especially since I've started getting used to its low mana and health alerts. So I looked around and played with it a bit and this is what I figured out.