What is bubble around WW?

I’ve got a WW toon, and for the life of me I can figure out why there is a bubble around me whenever I get into combat. I took off all my gear, thinking maybe it was an Azerite trait, or some proc, but it still happens. I notice it on WW in arena sometimes too. Anyone know what it might be? Some talent or something I’m overlooking?

Thanks!

Tank trinket and your Resounding Protection traits.

With taking all the gear off?

It’s a passive effect called Afterlife. Those spheres will heal you if you run through them.