My son told me that he heard that Rosenbaum got shot in the back before Kyle killed him.
That gunshot that happened before Kyle’s managed to hit him in the lung I believe.
The DA's complaint states that Rosenbaum was shot in the back, with the bullet passing through his lung and liver. But surprisingly there is no exit wound visible on Rosenbaum's torso in the video which shows him moments after the shooting.
It seems strange that a typical 5.56mm round at close range would not create a visible exit wound. Presumably more information will come out about what actually happened.
The video recordings of Rosenbaum's attack on Rittenhouse indicate multiple people were firing guns, not just Rittenhouse.