The moment they teleported out of the Eastern Middle Bastion, the energy shield was fully activated. It became impossible to enter the Bastion through spatial teleportation again.
Even Nirvana predators were not able to teleport into the Bastion through their Life and Death Domain. This was also why only seven of the apex predators were able to enter previously.
Even the alien planets' clones could not teleport. The same could be said for those Boundless clones. Only the Violet Prince and Princess, who had completely comprehended their domains and had the origin power of the alien planets, could teleport. However, they needed to consume large amounts of energy to teleport others. That was an important reason why they could not deal Lan Jue a critical blow after they got into the Bastion. Otherwise, even if Xiuxiu had blocked the blow for him, he would have still gotten injured.