My Father Was Grabbing Onto The Sliding Door And The

My father was grabbing onto the sliding door and the frame and was leaning away (while still holding on) and was like slowly squating down until he just fell to the ground (still holding on). While it was happening, I was asking him what he was doing and he wasn't answering me. Until he was on the ground, I shook him and yelled at him and it took a while to get him to focus on me. It was like he was in a trance. What happened???