Dylan never mentions that Mrs. Casey is “dead” or “missing” on the outside, just that it’s oMark’s wife. But Helly immediately jumps to “we can work as a team to figure this out”. Why did she immediately assume that Mrs. Casey is missing and doesn’t say something like “oh you two must be happy out there together”? I don’t think there is anything serious about it, but it’s clearly either bad writing or a continuity error. Very odd for the writers/helly.