This is the part that has me asking questions. He is competent, most shooters are a nervous wreck after their first kill, and loose all ability to keep a bead on their next target, or panic once they think they have no escape route or plan to live through this. He was arrested, alive. If he did this in america, he would have been shot without question. This place was also chosen from a list, which means evaluation of multiple possible target sites. this would be difficult for a team of experts let alone a single person. This suggests training and combat experience in live fire engagements, and is too organized for him to be working alone.