Meddler on Recent Mage Nerfs and Reworks
Originally Posted by Riot (View Original Source)
If new Poppy uses her R while the enemy in within her W do they not get sent flying?
Poppy's W only stops effects that her enemies apply to themselves or their allies (so it'll stop dashes, jumps Thresh W pull etc). It doesn't affect displacements applied to enemies however, so if you're playing Tristana with an allied Poppy her W won't interrupt your ult's knockback.