A ballistics expert in the Oscar Pistorius trial returned to the stand on Friday and presented his theory of the shooting scene, which differs from what police investigators previously described.

IOL News noted that Wollie Wolmarans, who is a seasoned ballistics expert for the defense, started his testimony on Thursday.

The Associated Press reported that the expert said he believed that the four gunshots shots that were fired on Valentine’s Day 2013 were fired in “fast succession.” His testimony supports Pistorius' story that he shot rapidly because he was in a panic after thinking someone broke into his home.

Wolmarans went on to say that the first bullet was likely the one that hit Reeva Steenkamp in the hip, while the second shot wounded her forearm and chest. He also said that the model may have been leaning forward a bit when she was hit. Finally, he said that the third and fourth bullets were likely the ones that hit her in the head.

At times during the testimony, the double-amputee runner held his hands over his ears.

Pistorius is accused of intentionally shooting Steenkamp after the two had an argument last year. The Paralympian contends that he shot his girlfriend after mistaking her for an intruder.

If convicted, Pistorius faces 25 years to life in prison. He has plead not guilty to murder.