And then something set him off.
With two minutes left James drilled a three pointer from the left wing. On the next possession, he hit a contested two from the left wing. On the next possession, with the shot clock running out, bang: he hit another two from the same area. Finally, standing on the left wing again, with everyone, including the guy guarding him, knowing that he's about to shoot, James nailed a three pointer.
Turns out he put on this show to silence a fan.