Yup very unpredictable, sometimes it doesn`t trigger, and one time in a font it triggered the second time i got engaged by the same champ. The first time nothing happened and i thought it bugged, so i retreated to another square closer to shrine and when he followed he got knocked into the font center and lost 20 damage. That only happened once i think. It seems to work ok ish most of the time though.
Okay thanks, I thought I was losing it lol. It triggered the second time the champ engaged me, which was odd.