"It makes the job easy with a guy like him," Harris said.
"I ended up in a good spot but straightening I had to make the choice whether to kick up or pull back.
"Once I got out it was all over.
"I wanted to teach him a little bit as then we have options going into the other races.
"He could be the best horse I have ever ridden."
Connections will now turn their attention to the Gr.2 Sacred Falls Hawke's Bay Guineas (1400m) at Hastings and then the Gr.1 Al Basti Equiworld New Zealand 2000 Guineas (1600m) at Riccarton after that plan was confirmed by trainer Clayton Chipperfield.
"It was good to see him do that and prove that he has the ability that we all thought he had," Chipperfield said.
"I was getting a little bit worried though at the 200m when he couldn't get out.
"He just drops and glides as his turn of foot is phenomenal.
"We had planned on the same sort of ride today [as Hastings] but that didn't pan out, although he got a decent run anyway.
"[Harris] rode for luck and luckily for us we got it."
Chipperfield was still shaking his head about his good fortune in having a potential superstar in his stable after only taking up training on his own in the last 12 months.
"I've only really just started taking this game [training] seriously and to do this in the first year, with a horse like this, is a dream start," he said.
"We have three weeks now until the Hawke's Bay Guineas and then another month to the 2000 Guineas.
"He might have a jump-out or trial between those two races but that is the plan at this stage."
Bred and owned by The Oaks Stud principal, Dick Karreman, Catalyst is out of the Entrepreneur mare, Evana and hails from an all-star extended family that traces back to champion Australian galloper and sire, Lonhro and multiple Group One winner, Niello.