I was playing as sion, and ulted down the lane after a low health velkoz. Warwick ulted to intercept, and hit me from the side. This stopped my ult and suppressed me. Given the "immune to cc" status of an ulting sion, i feel this should not have happened. I should have collided with the warwick and knocked him up, or simply left him behind.
Most likely an interesting interaction of immune to CC. WW is immune while lunging to his target to ult, Sion knocks up the people he runs into. Thus, WW gets in the way, Sion stops and attempts to knock WW up, WW immune is still in effect since it probably deactivates a half second after he lands.
Basically you collided with WW, but he can't be knocked up since he is still "Traveling" while the knock up is supposed to take place. Check your replay to see if he took damage.
