User blog comment:RoznosicielCiast/Let's talk about unique champion synergies/@comment-25364408-20150222191426

This will require more testing and may have been a one time thing, but my friends, who were playing Vayne and Poppy, both pressed E at the same time, and they were on opposite sides of the champion they were targeting. Poppy stopped as the particle for Vayne's Condemn hit the champion, and they were stunned as if they hit a wall.