PHOTO: AFP
Southee and Boult starred with bat and ball as the West Indies were left struggling 158 runs behind on the first innings with only two wickets remaining.
The tail-end batsmen boosted New Zealand to 373 in their first innings with a 61-run last wicket stand.
The new ball pair then bagged four wickets between them on a benign pitch as the West Indies plummeted to 215 for eight at stumps.
Southee has two for 34 and Boult two for 67.
"That was good fun, in terms of the game," said Boult who smacked an unbeaten 37 off 27 balls to lift his average to 16.03. "Obviously in a first innings where we want to go big and get as many on the board as we can so a combination of runs and keeping their bowlers out there and their fielders and batsmen was pretty important. Believe it or not I take a lot of pride in my batting. Any contribution, not just myself but the lower order, is very pivotal."
But to see the West Indies run chase fall apart after they were off the field for 90 minutes because of rain came as a surprise.
"There wasn't much swing, in terms of the wicket it was a bit slow ... I'll tell you for free they're not too happy losing eight wickets," Boult said.
Raymon Reifer, 22 not out at stumps in his debut Test innings, accepted it was a good batting strip and "a few of the guys will be disappointed".
"Today didn't go the way we wanted it to go but we're still going to fight to try and get in a good position,” he added.
New Zealand added 87 runs at the start of the day, the bulk of them in the Boult-Southee partnership with the innings ending on Southee's dismissal.
But 10 minutes later he was bowling the first over of the West Indies' reply and took the wicket of Kieran Powell without scoring. He also had Shai Hope for 15 and pulled off a stunning catch to remove Kraigg Braithwaite, the West Indies' top scorer with 66.
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