You just directly contradicted yourself.
He says Reinforce told him it was a doctor, so I would like to see that message.That's the point, he may not the experience to sort out Safe Guard type roles. In all honesty this could be seen as a doctor role as you don't know what Nightmare does. For all we may know, Nightmares could be what kills. This isn't likely but you have to realize, he may not have the experience to realize that.