Olaf getting cc'd by enemy glacial while in ragnarok

Unfortunately I hadn't taken screenshots. 2 games in a row, I had Olaf ( I will try to recreate it, since i got no vods of TFT games). I played against another glacial comp, would it be berserkers with voli+olaf, or 4 glacials. Basically what happens is that my Olaf ults, and while in ult he would still get cc'd by enemy glacial comp. (he would ignore all the other cc's out there) ( I had Blademaster+Frozen Heart+Runaan's Hurricane, or Phantom Dancer+Bloodthirster as items). Please if anyone else has any screenshots of that, you're welcome to share them here