Yasuo's Windwall Can Block Syndra's E (without any Qs)

Just came back from a duel with Syndra and Yas, where I wanted to consistently knock him back from his dash on me with Scatter the Weak. No spheres since that would take precious cast time. Yet he consistently blocked the knockback with his windwall and proceeded to continue autoing me.

Add it to the list of things that don't look like projectiles but are, I guess.