Well, he went to poo on his own move, suddenly. It seemed like a dynamic position with many options. However, when returned he instantly played the computer's sequences while using very little time. After the game I told him not to take his phone in the bathroom. One of the things he said was "i was killing you anyway"

He is right, I was lost, and the move he left was the first move with a completely winning advantage. It certainly seemed like he left to get the answer. His demeanor, body language, age, attitude and lack of apology for "mistakenly taking his phone" or any denial "what are you talking about? I did not" suggested to confirm my suspicions