"Some of the guys are on a high today but we must have a focus on coming back to do the same thing all over again tomorrow."
Yesterday Mitchell overwhelmed Ryan Chisnall 4/3, Joshua Dasent beat Glen Drummond 2up and Steven Harris edged Tom Dasler 1up, after captain Ben Swinburne, who has yet to register a win this week, withdrew to give the younger players a taste of elite golf.
"Mitchell played very well to take out Ryan who is a New Zealand representative," Howie said.
"Steve and Josh did well because anything could have happened on the last hole."
Carlos Tawera, moving up one like everyone else did below Mitchell after Swinburne's withdrawal, lost to Blair Riordan 5/3 at No 2.
Dallas Williams went one down agonisingly to Nick Loach.
"All the other matches ended on the last hole so it wasn't very good for my nerves," Howie said.
Mitchell said Swinburne was very much the captain, talking him throughout the day on the course.
"We got a little tight towards the end," said the Maraenui club member said, adding his teammates didn't buckle under pressure as they did against North harbour on Wednesday.
In the biggest upset yesterday, Auckland spoilt Wellington's unblemished party with a 3-2 win.
Bay of Plenty, seven-time champions out of 11 years, and Manawatu-Wanganui have cemented their favouritism heading into the final two rounds.
BOP beat Southland 3.5-1.5 to all but secure their place in the final four from division two.