Check out the link to my Xbox DVR screenshots, the portal at the back of the room where the boss spawns was hinged open like a hobbit's door! Grenades will pass through the opening but my guardian could not.
This was a Nightfall strike.
I've not seen this before and I've run this strike a few times. Anyone else come across this before?
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Time gated content? Great find though I'll have to check this out and see if this shows up on a normal strike or if it's just NF only.