How does urgot's new ultimate interact with shields and health boosts?

So i saw the new urgot rework. I'm just wondering, How does his ultimate interact with shields? lets say he shoots it while my ally is marked, i give him a huge shield as like janna and he is no longer within that threshhold. Can urgot still reactivate his ult? or if i shield an ally before he ults and the shield expires, can he then reactivate it anyway? just wondering how exactly this interacts. Mostly intrested if shields can stop the recast.
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