[GAMEPLAY] Possibility of double using Shen's ultimate

As a Shen I was able to use my ultimate two times, one after another, because it did not go on cooldown when I was channeling it, and my friend who was playing as a Kalista used her ultimate on me. We managed to do this two times in a single game. I'm not 100% sure it was exactly as I'm saying but enemy team was really unsatisfied with Shen's double Stand United. We both and had Blood Moon skins if this changes anything...

I was not able to notice when exactly she ulted me in the whole process because I was too busy with completely losing whole game but maybe I will be able to post something more after trying to play this combo a few more times