The videos are on line to be viewed but it appears he has had a stroke. He starts to lift the glass and on the other video a bottle halfway then has to assist his right arm to get it to his mouth.
I wonder about that. There are many photos on the internet of him drinking water at various times, using both hands to hold the glass. Not sure if it's just a habit or if there is a physical reason.
If I am sitting is certain positions, especially when my right elbow is stationary, I too will perform an assist with my left hand. Then there was about 40 years ago when I was having stress attacks for some reason. If I was on my own, I was okay but to drink something in front of someone or even hand something to someone, it took two hands to keep steady.
I think that his jacket was just way to small for him,probably restricted his movement. People are making a big deal about hobbling down that ramp. Wearing high heels and having 70 pounds of belly hanging out in front could cause that.