LeBron was telling him something along the lines of

"Fuck the other 50 minutes of this game, right now, you need to focus, catch this ball, and get fouled, because you're our best free throw shooter. Make them buckets and win this game."

He more or less confirmed that in the post-game interviews.


http://www.ohio.com/sports/lloyd/cavs-110-hawks-108-ot-jason-lloyd-s-20-thoughts-on-lebron-james-irving-s-free-throw-streak-1.673322

Read #10 on the game points list

(For the record, that WOULD be the game that Kyrie got chewed out for something like that; he had an awful shooting night, and a couple of ISO-fests that shouldn't have been in the 2nd half. Then again, that's on Lue for not switching him out for JR at least 5-10 minutes into the half)