That prospect grew even more improbable as soon as Southee and Boult took the new ball, with opener Brady Barnett top-scoring with 19 before the collapse began. Twenty-six overs later, ND had solidified their spot on top of the standings.
There were similar scenes of ball dominating bat in Rangiora as Canterbury moved into a promising position against Otago. Having started the third day on 176-3 in their first innings, Canterbury's Ronnie Hira continued his transformation into an opening batsman with a maiden first-class century, before the bowlers took control.
Neil Wagner grabbed 5-76 as Canterbury lost their last seven wickets for 34 runs, being dismissed 159 runs in arrears of Otago's first-innings total. But Canterbury soon turned the tables as Otago were skittled for 139, with Hamish Bennett snagging 4-34 as no Otago batsman managed more than 25.
By the end of a day in which 19 wickets fell, Canterbury were on 92-2 and, with Peter Fulton (33no) and Neil Broom (45no) at the crease, needing 207 runs for victory.
Meanwhile, only 17 overs were played in Auckland's clash against Central Districts at Eden Park's outer oval, with the visitors ending the rain-disrupted day on 308-8, leading by 350 runs.