The dejection on Milne's face was palpable during the match, as the injury threatened to end a seminal summer.
Midway through his eighth over he spoke to captain Brendon McCullum about the niggle. It was the start of his third spell in a match which had him regularly clocking in excess of 150km/h - the speedball radar counted eight occasions. It's understood Milne wanted to continue but McCullum advised otherwise. The 21-year-old left the field.
McCullum said: "It's tough for Milny to get injured bowling at that pace ... It doesn't look great."
Fellow bowler Mitchell McClenaghan said he was "absolutely gutted for the man".
"He had his [T20I] debut [as an 18-year-old in 2010], went back [to domestic cricket] worked on his accuracy and returned.
"To see someone bowl that quick and accurately is a throwback to the Shane Bond days."
Milne has been cast as "the new Bond" but needs a chance to settle if he's to sustain a career rather than being remembered for a fleeting link with the number 150.
The World T20 scheduled for Bangladesh (or possibly Sri Lanka or India) in March might be a logical return date.
Bennett will join the Black Caps at training in Hamilton this afternoon. The 26-year-old last played a ODI for his country in March 2011 against Sri Lanka in Mumbai.