"Faces fading in the flames, it was all her fault." Jinx/Vi clue. Also "C."
Swain's interaction with Jinx. So......speculation deduces that Vi intentionally or unintentionally kills some one close to Jinx, and is why she targets her in Piltover? Honestly, imo, I'm not sure Im looking forward to that story...
Also, is Riot implying that that C from Cait's story is Camille? That's the second time they hinted C(first with Camille) now with Swain.....Is Camille really C? And again, my personal opinion for that; I wouldn't be looking forward to that story either. That would feel like they just ran out of ideas to make for the Calling Card story.