"Thank you," he says, "But I don't think that's necessary." (The second sentence is to be ignored, it's just to stay in character. She can tell that.)
String, loop, snake, coil, Coil it is, then, and the man with a secret power is a thinker who can't recognize treachery or deceit but has some paths to counter it anyway.
... He's potentially interested. Chiefly because Coil is spying on him, and if this is as a prelude to an attempt to murder or kidnap him he's going to want Coil dead, but also because he would appreciate having superpowered muscle for some of his plans and he considers the Undersiders to be talented youngsters with a great deal of potential who are probably going to pick a fight they can't win (but could, in ten years, with proper equipment and training) and all die before they turn twenty, and that's just a waste of talent. On the other hand, he does not want his secret identity blown, and while they have a great deal of potential being involved in supervillain fights either personally or as a sponsor in any identity that could be traced back to him would be an extremely large downside, and he is frankly not certain that every member of her team is as attuned to high-stakes negotiations as she is.
(His opinion of the Undersiders isn't really deliberately sent, it's just that Tattletale will pick it up if she tries. By their standards, he's pretty bad at lying.)
If Coil's spying on her through her bugged phone, he suggests she -
- limits of their method of communication, can't just tell her any of his phone numbers or email addresses with it -
- He can put a note for her in his mailbox once he's no longer being spied on with a throwaway email address on it that she can use to get in touch with him, or read via bug if Skitter is in on this and her bugs have good enough vision. Or put it at some Schelling point location in Brockton Bay, though he doesn't trust her enough to show up at a location of her choosing where her deadlier teammates might be present in person, yet.