While the three-year-old Give Em A Clump did slow down, it was not enough to prevent Moore being knocked to the ground - but she somehow managed to keep hold of the reins.
Without even dusting herself down, she went on to unsaddle the gelding before returning to her day job.
Moore, who used to be an amateur rider before her career as a broadcaster took off, made light of the situation when back on air.
"They'll have to put the divot back in, but luckily it's on the jumps track so they'll have time to get the truck on the track!" she said.
She added: "Keith Ottesen [clerk of the course] had got him to run down a good part of the track (to be caught), which is where we were. There were horsey people around and I thought I would try to help.
"He had started to slow down - I wouldn't have done it if he wasn't! He just caught the side of my face, which is what knocked me down, but I'm fine.
"I just couldn't bear the thought of him going round again, especially on quite a hot day. He had the blinkers on and I think he was panicking a little, he was running on adrenaline.
"I'm used to catching horses, but not quite like that!"
Otteson praised Moore's bravery.
He said: "I thought it was a hell of a tackle. She was brave - too brave, really - but luckily she was fine.
"It was one of the best tackles I've seen in Wales. We wouldn't normally advocate that sort of thing, but we all know where Hayley comes from."
He added: "Fran is all right, basically. He was just a bit shaken up by it all and was stood down for the day."
