OK, I clearly started channeling Q first and then clicked E, this combo shouldn't have failed. I've done it 1000 times. After this I started a custom game and spammed Q+E as fast as I could just to make sure, but the ball launched as it should have every time.
Hey friend,
Syndra Q+E has historically been buggy, but this interaction is known and intended. You can Q+E quickly and if you did it fast enough and your Q is close to yourself then the E will be long gone by the time the Q shows up. Your gif example cut it pretty close, but If you want to see this again then cast Q basically right in front of yourself and immediately cast E.
Syndra Q+E combo has some other reports that we're looking into either way, but this specific interaction will not be changed most likely.
Then it seems it was just random one-time bug
You need to remember that syndra is in the same vein as azir and orianna
Extremely complex and have many parts to her which interact in all parts
Melee range spheres often fail. I'm fairly sure it has to do with how narrow the cone is near Syndra, it's actually far more narrow than the visuals imply. If you're even a couple of degrees off hitting the ball dead centre her E will not connect with it.
