The powerful right-hander combined with Tim Seifert in a punishing stand for the first wicket against Pakistan which carried their side halfway to victory basically.
It was raining sixes at the University Oval.
It also rained earlier in the day and the T20 was reduced to a 15-over affair.
The Black Caps strolled to a five-wicket win and lead the five-game series 2-0 after restricting Pakistan to 135 for nine.
That seemed like it might be a decent enough tally.
But Allen (38 off 16) and Seifert (45 off 22) went on a six-hitting blitz — some of them massive.
They whacked five apiece.
Incredibly the team’s first five scoring shots were all sixes.
Seifert broke the chain with a brace and then promptly clobbered two more sixes.
Pakistan actually started their innings in the field with a maiden. But that proved a false dawn.
Allen got cracking first and then Seifert joined in and he dominated the strike for a period.
Allen brushed off a lighthearted suggestion they were competing to see who could hit the most sixes.
"I think it's probably a competition who can get some strike," he said.
"I'm losing at the moment.
"I think we're just both naturally quite aggressive players. I suppose probably trying to assess the roles that we're trying to play for each other and I guess we're both trying to take it to the opposition."
They certainly did that.
The game was won with the ball, though.
The Black Caps took regular wickets and kept shifting the pressure on to Pakistan.
"I think we started well with the ball. They probably took a slightly less aggressive approach up top and then we just capitalised in the middle, kept taking wickets which stemmed the flow of runs for them.
"And then with the bat we just looked to be positive as usual."
