MS NHLAYISI
Yes he couldn't identify them but his evidence is that at the time when this incident happened there was nobody at the school. According to him the school was in recess if I remember well, therefore he didn't expect that there was somebody in the school premises.  He had earlier seen these people he was chasing, running into the school, therefore he believed that these people walking in the school grounds were part of the group that's running to the school ground.  I wish to concede that he might have been negligent at that stage without identifying these people, to assume that these were part of the group but in this mind, as this thing was happening, he really believed that these were the people that he was chasing and that's when the second shot was fired.