Despite the one high scoring wave, the heat remained open with Butler backing up with an average 3.20 point ride, which eventually proved enough for first place and progression into the third round alongside Malakai Martinez (CRI).
"Judges seem to like the finishing moves, but a long wave with powerful moves will still get the big scores," Butler said after his fine performance.
Paerata-Reid surfed a textbook heat in the under-18 boys' division, opening up early with a heat-high 6.67 point ride.
He then went about putting the pressure on his opponents by building around his first wave until he sealed the heat win with seven minutes to go with a 6.40 point ride. He finished with a 13.07 point total to progress alongside Portuguese surfer Thomas Ferreira.
On the second podium the girls made a clean sweep on their heats - all progressing through to the second qualifying rounds.
Jasmine Smith (Gis) won her match-up while Britt Kindred placed second. In the under-16 girls' division Elin Tawharu (Mount) won her heat while Kea Smith placed second in hers.