Hadlee said the wet conditions during the bowl-off were challenging.
"They were contending with slippery footholds and a wet ball. But for all that they gave it their all."
Boult, who is in the New Zealand Under-19 team, bowled 130km/h to nab a spot in the finals.
Corey Anderson of Christchurch Boys High was the fastest of six qualifiers with 138km/h. Boult's favourite cricketer is Shane Bond, whose bowling speed tops 150km/h.
Trent, who met Bond and other members of the Black Caps yesterday before they flew out to the World Cup in the Caribbean, has set his sights on bettering his idol's achievements.
"I want to be the best bowler in New Zealand - even the world as well," said Trent.
"You've got to aim high, don't you?"
Hadlee said the finalists quizzed the professionals on technique, with Bond asked for tips on how to bowl fast.
"He talked about rhythm, relaxation, co-ordination, things like that rather than trying to run too fast and trying to muscle it down there."
More Boult appearances in NZME. papers
