The treasure hunt was written by TJ. Chase and him feel guilty because they killed Sydney. The treasure hunt was a way for TJ to escape from his demon and a way to trap Chase in revealing that he is the one who killed Sydney.
I am confuse did TJ do this on purpose or was it a accident since. i don't know if they ever said it or not long time i played it. Then what really grind my gear is yeah what the heck is going on in Echo i mean in TSR we are getting why the hysteria started but not what the think is(so i hope the will be answere in cliff route).
Since is earn for closure i mean all bad ending i know it is a horro game but i would love to figure out what it is and how to counter it is this to much to ask.
Also i am sad for Sydney in Flynn route we get to know him and i am sad that he had to die.