Pascoe laughed that she heard the Aussie duo closing in over the final metres.
"I couldn't see them but I could definitely hear the crowd, so I knew some Aussie was on my back. It was tough, but tonight was about winning. I'm stoked to back up what I did four years ago."
The 25-year-old always sets high expectations for herself, and noted that her Commonwealth Games performance will only spur her on to success at the 2020 Paralympic Games in Tokyo.
"It's great to come away from these Games knowing that I've given everything, but there's a lot to work on as well, and that's what it's about.
"When you set high expectations, you go out, you perform, but there's always something to work on - the big picture is Tokyo."
With Leonhardt aged 17, and Jasmine Greenwood claiming a remarkable fifth at age 13, Pascoe knows that things are only going to get tougher from here.
"Half of that field is young blood, and I'm old blood now, and it's about using that experience and perfecting the technique and working on all the little things which will get me through to a successful performance over in Tokyo."
Elsewhere in the pool, Bobbi Gichard missed out on qualifying for the women's 50 metre backstroke final, while Sam Perry and Daniel Hunter also came up short in the men's 50 metre freestyle.