Castor, used to following a woman's instructions and definitely willing to do so right now, followed obediently. Wherever they were going, it was where Pol was -- he was certain that Iris would be able to find his brother, because... well, she would just have to, that's all.
He tagged along behind her, doing his best to be helpful and try to find Pol, too, though he wasn't really sure how. All this god stuff, all of this was meant to be Pollux's, not his, and aside from the coming-back-to-life stuff, he simply didn't know or understand it. "I'm not Zeus's son," he said aloud. "I mean. They call us Dioscuri. But that's Pol not me. Iris I'm a mortal I mean it's what I am. I can't do god stuff. I'm sorry. I can't like feel where he is and I don't know how to find him."