How much force is required for a punch?
Mann’s physical defense forced Doncic into travelling. After the whistle, Mann swiped the ball from Doncic so L.A. could have it. That’s when the altercation really got heated.
Doncic stuck a fist into Mann’s chest. Mann responded by putting his fist on Doncic’s neck.
I wouldn’t describe either action as a punch. Neither players really swung through. But both landed fists on their opponent. They’re fortunate referees let this go with only a double technical foul. Doncic and Mann left themselves open to bigger penalties.
On a grander sense, the NBA should do something about the initial problem – a player grabbing the ball from an opponent after a turnover. This happens frequently and too often leads to dust-ups. Only a referee should get the ball from a team that lost it. An opposing player trying to take it should receive a tech. A player holding the ball too long should receive a delay of game. Enforcing those rules would end a lot of tension.