Butler scored eight consecutive points in 55 seconds to begin the extra session as the Heat recovered after blowing a seven-point lead in the final two minutes of the fourth quarter. It snapped the Raptors' ideal record at home, making it 9-1.
Norman Powell led the Raptors with 23 points, including a go-ahead three-pointer with 42 seconds left in the game - his fourth of the night from beyond the arc.
Olynyk finished with 16 points for the Heat.
Siakam and VanVleet, the two main horses who carried the Raptors during their shorthanded span, finished a combined 10-for-30 from the field for 34 points as they, rather decidedly, were unable to find that rhythm Lowry mentioned.
The Raptors were 5-2 in those games, their only losses coming to the Boston Celtics and Milwaukee Bucks. A fracture in his left thumb precluded him from performing most basketball activities, limiting him.
It was pretty apparent that after not playing altogether for almost a month - and including new faces such as Davis and Hollis-Jefferson who weren't really in the mix before - there's going to be an adjustment period over the next few games, with Tuesday's being the first. The fans roared for him. He was averaging 24.0 points, 6.7 assists and 4.6 rebounds entering that game against the New Orleans Pelicans on November 8, doing so on a career-best 48.1 percent shooting from the field and 42.9 percent from the perimeter. He and VanVleet started Tuesday's game in the backcourt together, as they had earlier this season, and shared the ball-handling duties.
Coach Nick Nurse said Lowry's playing time will not be restricted against the Heat. While his shot wasn't falling, the veteran point guard kept contributing elsewhere - more assists, rebounds and defensive help. And for years, it has been almost a lock that Lowry will be a much better quote after a poor performance than after a good one. "I missed shots, I didn't force anything, everything I shot came within the offence and honestly a lot of those threes went in and out". That should be easier, the coach noted, now that players down the bench have proven they deserve minutes.
"We have to figure out how we play, myself and Serge figuring out where to be at", Lowry said after the game Tuesday.
Two shots finally fell for Lowry from the field in the fourth quarter, and he also bullied his way to the free-throw line repeatedly, resulting in a 10-point quarter as the Raps challenged for the lead. He assisted on Powell's critical three-ball, too. The Raptors had gone 9-2 without their five-time all-star point guard. Heat rookie Duncan Robinson added 22 on the night, including six three-pointers.
Powell remained in with starters down the stretch, despite being pushed out of the starting lineup due to Lowry's return. "Just two good teams going at it".
Now almost back to full strength (Matt Thomas is still out with a finger injury), the Raps must regain their chemistry with star pieces back in the fold.
Toronto hosts the Houston Rockets on Thursday, then visit Philadelphia on Sunday before returning home to host Kawhi Leonard and the Los Angeles Clippers on December 11.