How does Doc Goldman describe Collins in the novel, After Dark, My Sweet?

Doc Goldman tells Collin that if he were really unstable.... "People could see the danger then. Now, well, what do they see, now? Why, they see an unusually handsome young man. A little eccentric perhaps, a little slow on the uptake occasionally, but in most respects normal. So they treat you as though you were normal, and the result sooner or later, is certain to be tragedy."