So, this post is building upon one of my previous posts regarding the Darkmoon Card: Death and it proccing while mounted.
This time, I brought a picture (!) and another discovery along with it.
I was duelling for a quest when getting to phase two where the marks you are collecting is called Valiant's Seal. During the duel with the valiants, I noticed that both Vindication and the DMC Procced during the fight. Unfortunately, I didn't get it on the pic, but I made this, attacking a melee target.
It might prove usefull, which in my case it already have. Basically, it's only cus of the fun of it really, as it really helps me in duels. But again, it also makes some quest slightly easier.
Hope it helps for you aswell!