He's speaking Urdu with a Pashtun accent, meaning that he's from the northwest areas of Pakistan.
Unfortunately, Pakistanis have a history of killing each other for money. The existing Pakistan Army was created by the British as the British Indian Army manned by locals and led by British officers. That's how less than 50,000 British ruled over 350 million Indians for 200 years. The British Indian Army fought for the British all over the world, including against Muslim countries.
The Indian Army during World War II, a British force also referred to as the British Indian Army, began the war, in 1939, numbering just under 200,000 men. By the end of the war, it had become the largest volunteer army in history, rising to over 2.5 million men in August 1945.
The army fought in Ethiopia against the Italian Army, in Egypt, Libya, Tunisia and Algeria against both the Italian and German armies, and, after the Italian surrender, against the German Army in Italy. However, the bulk of the Indian Army was committed to fighting the Japanese Army, first during the British defeat in Malaya and the retreat from Burma to the Indian border.
Indian Army during World War II
Recently, the Pakistan Army was hired by the Americans to fight against Russia, and later against the Taliban.
So, there's no surprise that different countries hire Pakistanis to fight for various wars. In Syria they're fighting on both sides.