So while raiding, our party was sadly separated and sad it was. We blew up both shriekers and headed off to try to get our loot only to have one member get past the shriekers wall before it respawned and trapped the rest of us behind it after it was killed. The chest was opened in hopes of the wall going away, but no dice. We struggled for a little more than 5 minutes to try to brute force our way through or around it, but had to give it up in the end.