Hmm. This is kinda like with Gemma. She hit her head and died later because of it. I think that Dan wouldn't have said anything if he wouldn't have heard that the police wanted to talk to Cain.
Wish soaps would start showing how hard it is to crack a skull rather than make people think if they get punched that's it if they hit their head of a rock everyone that's died from that they snap their neck not crack their skull