(Gameplay) Yasuo breaking supression
So I was playing a match today, with a Yasuo mid against a friendly Malzahar. Post 6, Malzahar would ult Yasuo, and then Yasuo would use his third Q to launch Malzahar and kill him. Later, I (playing Skarner) ulted Yasuo under a friendly tower, held him in suppression for a full second, just before my ult ended, he launched a whirlwind and killed me. I'm not sure if it was server lag that was not loading his Q soon enough, or if he is not responding to suppression correctly, but this occurred several times over the course of them game. This is an incredibly frustrating bug because he was breaking out of sure kills, and rendering two of my teams ults basically worthless.
Any help would be greatly appreciated.