Also, I was counting indirect damage the PC is responsible for. If we count all available spells and caster abilities, we need to do the same for the other classes as well. Therefore, When I once per short rest redirect damage using the cloud rune, that counts. Not only in preventing damage from an ally, but inflicting it to an enemy. So when that gnome mindflayer made an attack roll inflicting 58 points of damage to the monk, and I redirected it to their buddy mind flayer, that should count towards my overall damage output. IMO anyway.
I certainly think it counts: an ability you used caused the enemy to take damage, therefore counts as your damage - keeps it simple.
Certainly interesting to have an ability that gets stronger the stronger an enemy attack is!