Taric's new ultimate

In the limited amount of information out on him atm, it says that "after a moderate delay, Taric and nearby allies become invulnerable for a few seconds." In the video of it, it shows that allies within a circle slightly smaller than amumu's ult do become invulnerable. But it doesn't look like a stasis effect like Zhonyas, Bard Ult or Liss ult. In fact, in the video, the champs (panth and Leona) continue their idle animations.

So Riot, are allies within the circle able to move around during the duration or maybe even attack?? Or is it another stasis?? I need answers!!!