[{quoted}](name=Draco the Reaper,realm=NA,application-id=3ErqAdtq,discussion-id=UtuK8keR,comment-id=00030000,timestamp=2017-03-11T20:51:11.794+0000)
Because if they make it so Windwall doesn't block Lux's ult because "wind doesn't block light" (rough quote) then a barely 2in blade can't perry or block a roughly 3 foot diameter laser
Here, allow me to teach you how to think in context.
Context is the king of the world.
Under the context of League of Legends, a (Fantasy-based, though this part is practically unimportant at the moment) game, we need to think under the rules established by the game through coding and not the laws of physics or logic or any of that shit.
Yasuo's Windwall blocks projectiles. What are projectiles? They have visible travel-times, travel-speeds, an end destination in mind, and are not coded as a unit (i.e Minions). Yasuo's and Braum's walls will block all that fall under this rule, much to the spite of all the annoying bitching idiots that try to apply logic to Yasuo's wall. Nami ult? Stopped. Void energy surging from the ground. Blocked. Tali ult and Braum ult? Stopped in their tracks. Energy surging from Fiora's riposte? Yes still blocked.
What aren't projectiles? "Lasers", or, as I like to call them, instantaneous effects with fancy animation. Lux ult isn't a projectile. Vel'koz ult is the same. Viktor Q enhanced AA isn't, nor is Azir AA. These have an automatic effect that have a lazer-like quality. They aren't coded as projectiles, and thus are not treated as such.
Fiora's riposte, however, is coded as a spellshield with the added effect of stunning those that attempt to apply any cc on her and are in the hitbox of the blue or gold box. Spellshields block everything in the game. Everything. Applies to Nocturne, Sivir, EoN and Banshee's. These will completely nullify anything thrown at them for a short window.
Honestly, this might be slightly dumber than all the people crying about Yasuo's windwall blocking things that, under real logic (again, it does not apply to a game), it should not block.