"I couldn't tell you 100 per cent really [what happened]," said Leitch.
"I haven't seen any footage apart from some stuff from the TV. They made contact - I don't know how it happened - and that fired the guy beside me into me.
"Then by the looks of it some part of his car hit my rear wheel and sent me up in the air.
"The rest of the thing happened within about two seconds."
Despite the spectacular accident, Leitch was able to get out of the car relatively unscathed, with Andres and Leeds also uninjured. Shortly after the race the car had already been stripped back for inspection, with Leitch saying that he expected to be back in action for today's final two races.
"Nothing's not fixable. The car is actually not as bad as we may have thought - I've seen far worse," he said.
"We'll be back out there, 100 per cent. We'll be ready in about half an hour just about.
"It's just a couple of things, and a nose box - I've done a bit of gardening and filled the entire nose box up with dirt. Pulled a couple of Gs, but it's not really too bad. "Hurts the budget a little bit, but nothing too serious. We'll get it back out there in the morning."
Second-generation racer Pedro Piquet won the race with a comprehensive lights-to-flag victory to beat M2 Competition team-mates Jehan Daruvala and Christchurch driver Marcus Armstrong.
Starting from second next to pole-sitter Daruvala, Piquet made the best jump off the line to lead the field as they exited turn one. From there the Brazilian was untouchable - eventually winning by 3.453 seconds.
The race tightened the championship standings with just two races left to go; Piquet is just five points behind series leader Thomas Randle, who finished the first race in fifth behind fellow title contender Richard Verschoor.
Verschoor now slides to third in the championship, ahead of Daruvala and Armstrong.
The final race of the weekend, and the season, doubles as the 62nd New Zealand Grand Prix.
