Although 17-year-old Gisborne schoolboy Matt Scott finished inside the 5 minutes, the next open male was Mount local Sam Shergold, an agonising 32secs adrift of Beattie and Taylor's altered time of 2h23m07s.
"I'm exhausted, to have a race like that finish with a sprint on the beach isn't fair on either me or Cory," Beattie said after crossing the line to a wild scene involving talk of protesting the penalty.
"I thought I nearly let Cory get away on the way into the beach.
"He put about a board length into me and nearly got down a little runner so I'm thanking my lucky stars I got one up to him. I knew I had a pretty good line so I definitely thought about that on the way in.
"It turned into less of a race and probably more teamwork over the last 6km board leg. We knew we had to put a buffer into that five minutes and we knew we had to share the workload.
"We train together three times a day, six days a week and we are really good mates. We knew each other's strengths and weaknesses and going into the race we knew it was going to be that way anyway.
"The Mount Monster has been something that has been on my mind since I came second last year so it was nice to be able to tick that one off."