"Oh, hi!" Takahisa perked up once Armin spoke up, nervously saying his greeting to them.
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"Well, I know that symbol perfectly fine, and I suppose Kaika must not be thinking straight when she used it. Simply, it is a symbol for "Soul Linking," meaning that both your soul and Kaika's soul had been linked together. So when Kaika was warped back here, you came along as your soul is linked to her soul, which was leaving your dimension. Soul linking can be easily done, but I know it would be necessary to keep it as it is until we send both of you back to your dimension and then remove the link from there," Nero explained the true meaning of that "symbol" on Eren's neck. By now, Peyton had started up the car and began driving back to their "hideout" house.