WATCH: Check out how Amy Pirnie set up her left hook from hell that put Yu Yau Pui to sleep in 49 seconds

Amy Pirnie came into ONE Championship with a big point to prove and time to make up for.

She did exactly that on her ONE debut earlier this year at ONE Fight Night 24 which took place at the start of August.

Stepping inside Lumpinee Stadium for the first time under the ONE banner, she met Hong Kong's Yu Yau Pui who was coming off of a run of devastating performances.

This didn't phase the Scottish striker one bit and in less than a minute, she closed the show with a devastating finish.

In a post on Instagram, Pirnie's unbelievable knockout was broken down after she perfectly timed a counter strike left hook that was all she wrote.

Watch her three-step keys to landing one of the most impressive knockout blows that you'll see from a debuting fighter.

Ahead of her return at ONE Fight Night 25, what better time to relive that statement finish via the following video:

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Amy Pirnie looks to carry this momentum into her next fight

A remarkable debut is just the start for Scotland's Amy Pirnie regarding her campaign in the atomweight Muay Thai division.

The 31-year-old has been on a very impressive winning streak that she now hopes to keep alive after arriving in her new home.

At ONE Fight Night 25, she returns to Lumpinee Stadium to take on Israel's Shir Cohen on Oct. 4 where Pirnie is certainly one to watch after the highlight she produced last time out.

Check out some of the best replies to the breakdown of her debut knockout via Instagram where the fans showed their appreciation for this beautiful shot:

magafarmerofficial:

"Left Hook"

_elipark:

"Flawless victory!"

irathetallthug:

"Lethal"

linzloo_:

"Bye Felicia!"

Now, Pirnie has the task of building on this in order to make a real run in the atomweight division.

ONE Fight Night 25 will air live in US Primetime free of charge for Prime Video subscribers in North America.