Even if it is something psychological or physiological going on in their brain, I've seen it several times in my husband now and it truly is like his body has been seized and he isn't even aware of anything. He did it again today, not directed at me he was angry at someone else and he was asking a question to me about this person in his native language, His body tensed up and he started to talk I think like his father, and I kept answering him in English, and he kept repeating the question over and over, as if he didn't hear/understand me. Finally he understood me, asked another question in his language, which I answered. Maybe after a minute or so I asked him, "Can I help you with something?" and he finally relaxed and answered me in English with what he needed help with.
He actually directed it at me the other night. He had left for his clinic in a pleasant mood and then came home a few hours later and finding I had closed both inside doors, he was too lazy to put his key in the lock and started banging on the door in his language, saying, "Open open!" I opened one door but he got angry and told me to go to hell and told me to come around and open the other door. Then he marched in like Arnold Schwarznegger in Terminator 2 when he goes into the bar naked to take someone's clothes, or in 3 when he goes to take the coffin with the weapons out of the cemetery. This stiff marching walk. He grabbed his blood pressure machine, turned around and walked back out. I called after him to tell him if he needed me to heat up dinner, just let me know, and he said back to me, "Go to hell." I found out from his mother later he was upset about something that had happened with a patient but again, it was very much like his father.
In fact, I remember one time while his father was still alive, I thought he was banging on the door to be let in in exactly the same manner, but it was actually my husband's uncle, they were so alike. We always joke about it because I opened the door in my nightgown thinking it was my FIL and found this strange man standing there and it was only after he told me who he was that I remembered him.
I feel like next time I should address him in his language and just ask, "Who are you?" and see how he responds. I want to see really what happens. Because he really goes into a sort of trance.