I really don't see that. If it is really true that both options are indistinguishably plausible, then what do you in response to this one event is absolutely meaningless. The next event could as likely come from "the other source", or from a new entirely one you don't even know about.
Your only reasonable option _in any case_ is to just strengthen your protection from both potential sources.
Suppose you are investigating a plane crash, and the evidence points to a possible uncontained engine failure, which apparently was caused by previously-undetected metal fatigue. The evidence, however, also almost entirely fits a bird strike. It doesn't really matter if you eventually find it was a bird strike, or not. Your engineers really think the metal fatigue could have brought down the plane? You are going to increase metal fatigue inspections, birds or not. And viceversa.