User blog comment:Willbachbakal/(Champion Rework) Kalista, the Spear of Vengeance/@comment-7709681-20150718155401/@comment-1330314-20150718184828

I think there's actually more interaction, or at the very least as much interaction: aside from Fate's Call, which keeps the same level of interaction while adding in more control, I shifted the Soul-Marked interaction originally on Sentinel onto Rend, by having Kalista's Oathsworn apply additional spears. Since that would require a lot more commitment than the Soul-Marked effect, I'd argue that would give Kalista more interaction with her Oathsworn.