"It was a bit of an emotional game, so close and so tense."
Appropriately, McKinnon's final rugby season behind the microphone got to extend out to the full six matches, given Cooks Gardens had not hosted a Mitre 10 Heartland Championship final since 2011, while before this year the last post-season playoff he called was the forgettable Lochore Cup semifinal of 2013, also against Buller.
McKinnon joins Wanganui captain Peter Rowe in retiring from this stage, and although Rowe was already hearing calls for a comeback by that very evening's aftermatch functions, McKinnon is content with his final match being a championship game in front of a big home crowd.
"It doesn't happen like that for everyone.
"I always thought the time was right. But I didn't know, I had to be reinforced that it was the last day.
"I'm lucky, Dave [Campbell]'s been in the wings for the last eight years. It's the right time.
"I started this when I was 28 and now I'm 70. It's been a very good innings."
McKinnon took over from Eugene Crotty for radio 2XA in 1975, not long before the station became 2ZW and then morphed into what it is today.
As well as provincial games involving every New Zealand union, he announced fixtures involving New Zealand A, France vs Tonga, North Island vs South Island and an All Blacks trial.
He also called matches with the British Lions, South Africa, Super 15 and other internationals including World Series Cricket.
In 2014, after 40 years of sports broadcasts, McKinnon was added to the Whanganui Sport Roll of Honour, while also being presented with a mounted microphone from the NZME Media organisation.