Why did Robert semrau kill an insurgent?

Robert Semrau, a Canadian soldier, killed an insurgent in Afghanistan in 2008 during a chaotic encounter where the insurgent was injured and posed a potential threat to his unit. Semrau reportedly shot the insurgent to prevent him from being captured and possibly returning to fight against coalition forces. This action was later subject to legal scrutiny, as it raised ethical questions about the rules of engagement and the treatment of wounded combatants. Ultimately, Semrau was charged with murder but was acquitted of the most serious charges, leading to a complex discussion on military conduct in combat situations.