Hawke's Bay were back warming up to bowl not long after lunch.
No 5 Indika Senarathne was the top scorer in the hosts' innings, with 33 runs, in the three-day match to find who will keep the silverware over winter.
The CD white-ball cricketer from Sri Lanka fell to the spin of unwanted Northern Districts Knights player Boult who took three wickets.
Lower-order batsman Pretorius, of South Africa, was a run behind Senarathne after a concerted partnership with No 8 and wicketkeeper Scott Schaw who contributed 25 runs.
Tommy Clout and Brett Hampton also claimed three wickets each for the Peter Drysdale-captained BOP side.
Bay coach Colin Schaw named Jurgen Andersen 12th man while BOP counterpart, Graeme Aldridge, has Chris Atkinson running out the drinks.