Ezren defeated a Warden of Runes in the Temple and "attempted" to close it. Ghlorofaex appeared, due to the scenario power, and attacked Harsk (at the City Gate). But, instead of rolling, the City Gate closed and Harsk took two damage. And then, after returning, the Temple closed normally.

 

----

Android 6.0.1 on Nvidia Shield tablet K1

PFID #EC19BBE1B715AFA6

Story mode, The Road Through Xin-Shalast, Legendary difficulty, Close Quarters and Darkest Night

Pass and play off, permadeath on

Party of Lem, Valeros, Merisiel, Kyra, Harsk and Ezren

I've also experienced two locations closing this way, though I don't remember at what locations.

I use a Nvidia tablet as well-