The feeling of fear came after you jumped and after your heart was already pumping—the feeling itself did not cause the jumping or the pumping.
And fear may or may nogt be there and determiknes what happens next. So the big questuon from this standpoint is the specific role played and how you could still have a reliable measure. so afraid of the bus near miss sets a value for later firing which avoids all streets for exampld. What is yhe fear value / measure that makes a meaningful change.

