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)