Azir's Ult should do a bit more than knock back.
Maining Azir I enjoy his kit quite a lot. One thing I noticed about Azir is his ult. You summon a row of Shurimen dudes with shields that knock away your foes and they cant jump or dash over them. That's when I noticed the Shurimen dudes holding shields. I thought perhaps his ult being able to block projectiles but that would be over powered so I thought perhaps making his ult reduce projectile damage for all that are standing behind his shield wielding soldiers. Just an interesting concept I thought of. :D