Played a Steel Path Meso Void Relic Survival on the Grineer Asteroid tileset. In the first 5 minutes the Gustrag 3 showed up and were summarily executed. Afterwards, the grineer units were able to lock down the doors on the level, which is something enemies are not supposed to be able to do in Survival. Actually, they locked them down pretty much at every opportunity. I think enemies generally have a 30 second window after players have cleared an alarm, before they can lock-down again. These grineer where really into spamming that cooldown.
I'm also not sure if clearing the doors actually dropped the enemies out of alert/spawning mode. The amount of enemies on the map dipped drastically, so we only stayed for 10 minutes in full. When I ran to the exit, I found that most of the enemies had all clumped up in the room in front of extraction, similar to how enemies will run to the exit after you've met the exit requirements for an exterminate while stealthed.
