Just when I thought I had seen it all. In the Shroud run I just finished the rogue decided he didn't want to finish so he threw out a Greater Teleport on all the melee surrounding the pit fiend while still at about 5-10%. When told this was a pretty noobish move, his response was, "'i tped out and tossed others the chance. safer than ddor. if someone took it that didnt want it, its neither my fault nor my concern.'"
Please folks, if you don't want to complete the Shroud run for whatever reason, just use a Dim Door or Teleport yourself.