I want to corroborate on this, as it just happened to me and my teammate. I died to the void spike and after being revived, got stuck in the crouch position. I couldn't fire weapons, use abilities or use Transference. My teammate also got stuck and we had to leave before finishing the fight. I should point out that accessing chat and the main menu was also disabled until we left the map.
Here's a clip, if it helps. Please excuse my frantic dashing as I tried to figure out what was going on.