The hosts never threatened to replicate such a thrilling 40 minutes in the second spell but that removed none of the gloss from a win that handed Bay of Plenty a shot at the Shield next weekend.
To add salt to Otago's wounds, Hawkes Bay leap-frogged their opponents in the ITM Cup Championship, moving to within a point of leaders Northland. Otago remain adrift in mid-table after a day that went rapidly downhill after they won the coin toss.
Even that, giving them the benefit of a stiff breeze at their backs, quickly went wrong, with Ryan Tongia providing a dream start after Shannan Chase found space down the left.
Otago had barely seen the ball before Tongia popped up on the opposite touchline, running onto a perfect grubber from Richard Buckman to score a five-minute brace. And when Brendon O'Connor broke free to add a third, it seemed safe to start planning for next week.
Whenever Otago seemed set to enjoy a period in possession, Hawkes Bay struck with another long-range raid. First Chase found reward for his part in the previous tries, earning the bonus point inside half an hour, before it was Buckman's turn to break from deep.
The second half was more procession than challenge, with Jason Long adding to the carnage as the Magpies turned their attention to next week.
Hawkes Bay 41 (Tongia 2, O'Connor, Chase, Buckman, Long tries; West 4 cons, pen)
Otago 0
HT: 31-0