To make more sense, First episode of Arcane was shown free like it was planned - after a few hours after the Grand Finals ended(so that means this opening ceremony was shown before Arcane actually came out as well)
"I mean now we know" You have to realize. Those of us who play League. We knew what was coming in Arcane. Our point of view watching it, was knowing that in our world, Jinx is a psychotic criminal, and that Vi and Caitlyn are always trying to stop her. It was having watched Star Wars 4-6, and watching 1-3, while people like you (Don't mean that in a bad way) are people freshly into Star Wars for the first time watching 1-3. Us 'in the know' are looking at Anakin (Jinx) like 'ah shit... here we go again.'