I don't think it was about the last 4 minutes. By then, the Knicks were simply too far behind, and everything had to break in their favor for them to have even a chance.
Its mind boggling that Walker, Fields, Shumpert and Novak all played so badly on the same day. 31 shots at .225% is simply awful. (Its truly amazing that a combination of Chandler, Amare and Lin were able to play well enough to make the game close at the end.)
One might be tempted to criticize Lin for taking so many shots and having so few assists. But he did the only thing he could do, which was to stop passing to the guys who were missing, and take more shots himself. He gave Novak a key shot near the end, and he missed it yet again.