A dejected Major General Akari of the 18th Japanese Army under the guard of men of the Australian 6th Division at a checkpoint at Makow, Mount Shiburangu, New Guinea. 21 September 1945.
I was just about to say the same thing, though having read a lot about the Japanese Army in New Guinea and all the crap they had to go through, I can totally understand.
He's probably just been fed for the first time in three days and realized he wasn't going to be tortured or used for bayonet practice, besides seeing the general's dire predictions proved wrong. General lose face bigtime!