In BLG vs WBG game 5, after the shy’s Ornn updated light kalista’s rageblade , it lost the unique passive of applying double on-hit effect every 3 hit after max the stacks (that’s when purple visual effects appears).
At mountain soul point fight, kalista should be able to kill sejuani faster and might kill cait with another stack of E and bork. Cait and lux later stopped them from ending the game.
Source:bilibili video here (English not first language, sry about grammar)
With the AD and AP, the rend stacks would do an extra 11 damage each which is tiny, but also her autos would be doing an extra 10 each, and the 10% attack speed is hard to calculate.
I would like to see somebody attempt the math on this since I’m lazy, but based on the 200-300 hp people were left with after rend I would assume they would have lived with an extra 2 stacks in them. Based on how I feel from the fact that Kalista is my main for ranked, probably not, but that’s nothing to go off of.