This was Capsey’s latest failure in a run of poor returns with the bat, having only scored 27 runs in five innings in the WBBL so far, with a high-score of 14.
Capsey’s bad form with the bat began in October's T20 World Cup, where she made three single-figure scores, contributing to England’s group-stage exit from the tournament.
The 20-year-old took 5-25 in 3.5 overs, with three of those wickets coming in the final over, as Scorchers were bowled out for 108 in 19.5 overs.
Capsey, who is now the third-highest wicket-taker in the tournament, was then dismissed from the fourth ball of the Renegades chase by Chloe Ainsworth, after Courtney Webb was dismissed from the third.
Renegades were eventually bowled out for 106 from the final ball of their innings and they have now lost three of their five games. Scorchers have won three of their four matches.
Both teams face their next game on Saturday with Scorchers facing Hobart Hurricanes (23:10 GMT), while Renegades play Melbourne Stars (04:00 GMT).
Knight's half-century sets up Thunder win over Heatpublished at 10:01 7 November 2024
Knight's half-century was her second in three matches for Thunder since she returned from the calf injury she sustained in England's final game against West Indies at the T20 World Cup in October.
The 33-year-old hit 10 fours in her knock and has now scored 135 runs in three innings, at an incredible strike-rate of 175.32.
She was supported by Phoebe Litchfield's 40 off 25 balls and Chamari Athapaththu's 33 as Thunder posted 170-5 in Perth.
Thunder then struck twice in the powerplay with Georgia Redmayne (nine) and Jemimah Rodrigues (five) dismissed, before restricting Heat to 98-5.
Charli Knott hit 55 off 37 balls to give Heat hope but Thunder bowled Heat out for 151 in the final over for their third win in four games.
"I’m really pleased," Knight told ABC Grandstand. "It was difficult to start but when you get in you can really cash in so that is what I tried to do.
"It was a really pleasing performance and different players are performing at different times."
Thunder's next game is the Sydney derby against Sixers on Sunday (02:40 GMT), while Heat play Adelaide Strikers on Saturday (08:15 GMT).
He will now lead the Thunder, who he also captained in 2011, in this year's Big Bash.
"Captaining the Thunder again this season means a lot to me," Warner said.
"I was part of the team from the start, and now to be back with that ‘C’ next to my name feels fantastic."
Trent Copeland, Thunder's general manager, said the appointment is "huge" for the club.
"Appointing David Warner as captain isn’t just about winning, it’s about setting up our young players for success, surrounding them with leadership on and off the field," he said.