I do not know what its called:the challenge is that you have to attack,protect or do nothing.
you can attack or protect yourself maximum 2 times in succession and after tou are forced to do nothing.(I hope you understand what I mean)
I think that is green because specter cant lay footsteps and maroon has an hig IQ so if she were the murderer she would not leave footsteps,but I dont now why there is purple paint...