Just then the the three of them felt a little spatial fluctuations behind them, using their divine sense to see what was happening, they inadvertently showed a pained expression.
The massive door which was a gateway to the ruins was rapidly flickering as if it would fade out of existence soon but it was obviously not the case.
Everyone here was experienced, when they saw the cadets being teleported out of the ruins in random locations, they had already guessed that someone got the key to the ruins, else the only option to exit was through the door of the ruins.
So when they saw the flickering, it was obvious that whoever got the key was already successful in withdrawing the ruin. Just a few more seconds and they would be able to use the ruin just like a spatial equipment.