I agree that Chase should have maybe been more concerned and gone to the family sooner maybe, but would it have made a difference? It wasn't just Mike.
I just don't know at what point the burden shifts from Chase in this regard. I guess everyone has their own opinion on it, but IMO if a friend alerted my family that something was out of the ordinary, I would hope my family would be concerned and not think I was on vacation. But like
@mom2chloe says, I would never leave on a vacation without my family knowing either, and they would never expect that I was on vacation unless I previously told them. We have a rule in my house, that no one is allowed to leave the city without letting someone know, I have young "adults", I follow to many of these cases, I am a worrier lol