It looks like everyone expected a shot from Morris, and Davis was blocking out on a rebound at that moment. Also, Lebron and Green were open for a shot from the three-point line.
In this screenshot, we can see his options.
Obviously he would not pass the ball to Green again as that guy missed an open shot.
~
Obviously because he was seeing a mismatch but AD wasn't ready for the pass, probably he was still feeling the injury he suffered early in the game and he can't be too quick to jump to get the ball, or there was a miscommunication as the time expires to end the game.
I watched the replay and it was more like a miscommunication between the two. As @LogitechMouse and @btc_angela already said, Bam was able to box out AD. Morris probably thought AD wouldn't be pushed that easily that's why he threw the ball.
That was only 5 seconds left and they didn't decide a play for that, so probably Morris also panicked thinking time is not enough to think so he pass the ball to AD, unfortunately the pass was too high.
~ He played 47 minutes, how does a fatigue factor could affect on him in game 6?
This is actually a factor that I am looking at right now. I'm honestly rooting for them to win and force game 7 but it looks like Jimmy Buckets has already given it his all in this game. I'll have to wait and see what's going on with the Heat on social media before betting for game 6. Odds might also improve by tomorrow (currently at 2.73 at
Bitsler).
Odds stays I guess and Jimmy can play but it's up to us to speculate if that factor would really affect him, for me I believe it will.
Has anyone placed a bet on that?
. But I might get burned though, so much better to stick to ML go all in for Miami as I don't want to spread my bet. 
