What happened: Philadelphia 76ers wing Jaylen Brown responded with a cap emoji to remarks from former Boston Celtics teammate Jayson Tatum regarding the trade that sent Brown to Philadelphia. The reaction directly disputes Tatum's characterization of how the offseason deal unfolded.

Why it matters: The exchange surfaces lingering friction from the breakup of Boston's star duo after Tatum maintained he found out about the trade through news coverage. Both wings now headline Eastern Conference rivals following the summer move that reshaped the conference hierarchy.

What to watch: Every matchup between Philadelphia and Boston this season now carries added personal stakes for the former co-stars.