Well i think the amount of harms way is neglible considering they got a murder to investigate.
But i also think its a bit of a stretch to think Mr Green actively trued to murder that guy. I mean why?
He isnt really doing anything besides being there. And Levin also almost got all the answers correct.
It seems a lot more likely Mr Green is just a member of the Global Order like hinted.

Hmm.. also.. seriously..
They left Noah out of sight in a monster infested area?