Seeing the wide-open gate, Lucien, Charlie and Sandra were a bit relieved, because that meant the magic circle of the castle itself had not been activated. Either the core of the castle had been damaged when the summoning failed, or the low-rank demons just had no idea how to control the magic circle.
Either way was a piece of good news for them, as a sorcerer castle with an activated protective magic circle could be one or two levels even more powerful then the owner himself. This castle, designed and constructed by a third-circle sorcerer, could have the power of a fourth or fifth-circle sorcerer, and if the castle's magic circle had been activated, that would cost Lucien, Charlie and Sandra quite a long time to break into it.
However, cautious as Lucien was, he did not directly rush in there, but he stopped in the air, staring at the castle from above.