Again we see free will at work. We are often confronted with situations that we do not create nor do we desire. How often have you run into someone who is having a bad day and they are determined to pass it on. You may have done everything you could be avoid the situation. It still faces you with no escape. Now the choice is yours.
Notice that it doesn’t say you will calm the anger. All you can do is “turn it away” (7725). There is another verse that this brings to mind.
(Proverbs 25:21-22 KJV) If thine enemy be hungry, give him bread to eat; and if he be thirsty, give him water to drink: For thou shalt heap coals of fire upon his head, and the LORD shall reward thee.The possibility offered is that your refusing to return the anger will get them to think and maybe get a little embarrassed.
So? Whether it “works” or not we are still required to follow the words of Jesus in the Sermon on the Mount. That involves the other cheek and the extra mile. Be a peacemaker.