They would be able to leave the area safely as Raiden was keeping the man at bay from them, but Kaika was still unconscious and that device attached to her leg was still there. Though it was strange on how Nero and Umiya were not there at all, so it did feel like that whole encounter was a set up to get Kaika captured in the first place, a trap that they managed to get out of in time.
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Takahisa still had thoughts on Bernkastel lingering around here, and he knew that the witch was that devious enough to do at least something against him.