"I don't really think he's a horse to back up so we'll go home now and have a think about it," said Lock, who has been training for more than three decades.
"We could stop now and freshen him up and then maybe have a go at the Thorndon Mile at Wellington. It's all pretty exciting."
Hiflyer settled midfield and one off the fence at Ellerslie before he became strung up in traffic as the field swung for home.
"Half-way down the straight I didn't think he was going to get a run," Lock said.
Gaps finally opened for Hiflyer and he didn't need to be asked twice to take them and powered home to beat Splurge and Volkstok'n'barrell.
"It might be silly to say, but I think this horse is only going to get better next time in," Lock said. "He's still learning his trade."
Jockey Johnathan Parkes has now ridden Hiflyer six times for four wins and two placings.
"I managed to find the gaps and it was a big performance," he said.
- NZ Racing Desk