You can hear the shots from the AK47 in the video. The initial news reports said there were TWO different weapons being fired. There is one burst of say 4 or 5, then there is a pause and then there is a second series of shots from a weapon that sounds different.
Garrett never fired his AK47. Those five shots are a .45ACP or .357 followed by three shots from a .380, or possibly a 9mm. Garrett never fired. He pointed the gun in a specifically threatening way. Case closed.
Someone else in the crowd fired at the car after the driver defended himself