Waiters, it seems, was not well at the end of the flight.
According to ESPN sources, Waiters experienced a panic attack after consuming a THC-infused edible.
There is financial incentive for Waiters to get back on the court as soon as possible, there's a bonus in his contract for playing in 70 games.
THC/marijuana is a banned substance by the National Basketball Association - even if it is legal in Colorado (where the Heat had recently been on their road trip) and California (where the plane landed). If the league does slap him with a multiple-game suspension for his actions, he can kiss his money goodbye.
Beyond that, there are just questions, ones the Heat have yet to address.
Sources told Miami radio host Andy Slater that Waiters had a medical emergency on the team's plane flying from Phoenix to L.A. on Thursday night, and had a seizure after he "overdosed on 'gummies.'".
Local 10 sports has learned that Waiters did return to South Florida with the team and is said to be doing OK.
When Spoelstra was asked after the game about the "gummies" report he walked away and said no comment.
The Heat and Waiters have not commented.
The Heat were on a three-game road trip that included a stop in Denver (marijuana use is legal in Colorado), and then they flew to Phoenix.
Waiters has not played yet this season.
The Heat suspended Waiters for their season opener last month for "conduct detrimental to the team" after he expressed frustration about his role on the team on social media.
Waiters will miss out on a $1.2 million contract bonus if he misses four more games this season. Waiters is owed $24 million over this season and next as part of a deal he signed with the Heat in 2017.