I didn't know the respawns were limited, I spawned at SF when I died a floor down.I heard the same happened to my gangmates. Some of them died for the first time in the event.
It wasn't that they were limited, it was probably just a over-sight by the GMs. The outside area was changed to go to the re-spawn points, but the inside rooms are different maps, and GMs probably just forgot to connect the underground with the re-spawn points.
Nice Event - but what is dismantling ?