LeBron James Trolls Stephen A. Smith With Old Boxing Training Video

lebron james stephen a smith getty 1LeBron James hit the game-winning shot for the Lakers on Wednesday, but the real dagger came on Instagram later in the night ... when he ruthlessly clapped back at Stephen A. Smith AGAIN by mocking his fighting skills.

The King added another chapter to the beef after L.A. beat the Indiana Pacers ... clearly getting wind of the ESPN host claiming earlier in the day he would've "swung" on the four-time champ if he had put his hands on him during their Crypto.com Arena confrontation a few weeks back.

WAS READY TO THROW The Stephen A. Smith Show

Even though SAS admitted it probably would've resulted in getting his ass whooped, LeBron made sure the talking head…