I can just go straight on to the next chapter since the manga is long completed at this point, but I'm just going to comment for the sake of it. Nobody used the triple barrel gun (the one used on the Onion alien), so it doesn't seem like Tae was sent "up there." It seems like maybe she's been transferred to The Room by Gantz. Either way, it'll be interesting to see the dynamic in the group now. There doesn't seem to be a lot of justice or good guy vengeance in this manga, but surely Kurono has to kill Izumi at some point.