When you open the door, the massive difference in gravitational potential sucks you and everything in the afterlife through it. Sort of like a short circuit of gravity. Whoops.
Hey check it out. Every week we'll be revealing some new troll characters from Hiveswap until Act 2 is out. Follow the Troll Call here, and meet the first two here. Expect a few more surprises like this to drop in coming weeks.