I suggest this rendering of προπομπαὶ τῶν ἐξοδευόντων with hesitation, and feel no certainty about the passage except that the Ben. tr., “deductiones proficiscentium,” and its defence in the Ben. note, is questionable.  The escort of a bishop on a journey is quite on a different plane from the ministrations which Basil has in mind.  προπομπαὶ is used by Chrysostom of funerals, and Combefis explains “excedentium deductæ funebres, deducta funera;” but the association of ideas seems to necessitate some reference to the effect of vicious teaching on the living.  There may be an indirect allusion to the effect on the friends at a funeral, but to take ἐξοδευόντων to mean “the dying” seems the simplest.  ἐξοδευθείς is used of Sisera in Judges v. 27, LXX.  cf. p. 180 n., where perhaps this rendering might be substituted, and Canon Bright on Canon xiii. of Nicæa.