 Finally, in the sixth family of distinctions, we find a distinction that might easily be confused with the agent-relative/agent-neutral distinction as a kind of historical artifact. Here we have in mind the distinction between “reasons for an agent to do something” and “reasons for something to happen.” Without actually confusing them himself, Nagel may have unintentionally encouraged this conflation in remarking, for example, that, “Ethics is concerned not only with what should happen, but also independently with what people should or may do. Neutral reasons underlie the former; but relative reasons can affect the latter” (Nagel 1986: 165). In fact, however, it should be clear that these two distinctions are different. The agent-relative/agent-neutral distinction concerns the form of a practical principle, whereas the other distinction concerns whether a reason is a reason for an agent to do something or a reason for something to happen. One way of making the separateness of these two distinctions especially vivid is to note that someone might embrace the former distinction and admit that there are both kinds of reasons, but reject the very notion of a “reason for something to happen” as resting on an obscure, confused notion of a reason that can float free of all possible agents. This is not to say that we should in fact reject that notion; Wilfrid Sellars argues that a distinction of this sort is an important one (see Sellars 1968: 175–229. See also Castaneda 1975, with a discussion of Sellars’s distinction). Rather, it is simply to note that it is not obviously misguided to reject the very concept of a reason for something to happen, and we should leave room for someone to do this without supposing all reasons for acting are agent-relative, for that is simply another question. Even if I grant that all reasons must be reasons for someone, in that a reason presupposes a possible agent, I can still hold that the principle underlying those reasons need not make any non-trivial, ineliminable pronominal back-reference to that agent. Hence the two distinctions are different.