At first I couldn't understand why Hollins didn't shift Allen to Hayward so Gay could have the night off on defense. Then I saw his genius. Allen literally didn't guard Bell. He'd make a token effort to run at Bell and make a loud sound if he was going to shoot, but he mostly played the paint. He even got tagged with a defensive 3 seconds! This had 2 very noticeable effects:
1. On defense, his presence down low was able to deter entry passes. He also stuffed a Harris drive and picked up several rebounds.
2. On offense, he was murder in transition. He abused Bell on the perimeter a few times, but because he was not actually defending Bell, he was able to get out on the break without anybody to slow him down.
Also very interesting: Hollins subbed out Allen in the 1st and 3rd EXACTLY when Ty replaced Bell. In other words, this was all a very designed strategy. And it worked beautifully. When Bell was taken out in the first, we were down 6. In the 3rd, we went down a net of 6. In BOTH cases, after Bell was taken out, we went on runs.