I said they could be safe and certain, not that they were. They were safe and uncertain. They were safe because the minibus was moving away from them, posing no immediate threat. They were uncertain because they opened fire and made a mistake. They COULD have been safe regardless of whether they fired or did not. They chose uncertainty because of their itchy trigger fingers (assuming they didn't flat out murder the guy because he knew about one of their atrocities or something to that extent) and shot anyway. What they could have done is check to be safe and certain.