It seemed like DS stomps at first but he usually lets his opponents take a shot at him. If Todoroki freezes his insides, DS' limbs most likely break like Nomu's. But Todoroki did that on that single occasion IIRC. And I don't think he will do it on a human. DS never showed heat/cold resistance feats but he did say even he doesn't know what could hurt him. I'm assuming he at least tried hot and cold from that, so he should have a certain amount of resistance. The result is seriously ambiguous because of the lack of feats but I'm siding with Darkshine.