 Fourth, one is said not to cause an evil such as a death when one merely redirects a presently existing threat to many so that it now threatens only one (or a few) (Thomson 1985). In the time-honored example of the run-away trolley (Trolley), one may turn a trolley so that it runs over one trapped workman so as to save five workmen trapped on the other track, even though it is not permissible for an agent to have initiated the movement of the trolley towards the one to save five (Foot 1967; Thomson 1985).