Place it immediately after the impressive feat peaks, so the praise answers the action on screen. Follow it with DJ Airhorn to turn the compliment into a celebration, or open a Brazilian meme sequence with Oi Meu Chapa before the feat and let this line close the joke.
About this sound
This short Portuguese clip delivers the line 'Esse homem é um cavalo' in about 2.4 seconds, in a direct spoken delivery. It feels funny and admiring at once, like an over-the-top compliment for someone who has just done something impressive, and its blunt horse comparison makes the praise land harder than a plain compliment would.