Please properly clean up the TotA arena in between matches

I had an accidental portal pop up from having an Omen that creates one on death with me. That portal persisted and I created one in the Halls out of the way to get rid of it. (is creating a portal even making sense while being unalive? I would have expected that to be disabled in the Halls)
I also had one of the giant frost Balls Ahuana(?) creates over her persist and really get in the way since it's so close to the camera. She even still created another one normally while active. One just got stuck and abandoned.