Can/Should Cassiopeia "Grounding" ground a Yasuo's ult?

I have no clue how this interaction goes, and before i risk it all in a live game, I'd like to see the take on this. Basically, if a team fight breaks out and Cassiopeia w's a Yasuo, and an enemy of yas' gets knocked up, would/should yas be able to blink to them considering it IS mobility.
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