For example, lets say you are unaware of someone and they jump out and scare you. Well you kind of do a jerking forward motion with your whole body. That was how it was. This is the first time I have seen it. It really freaked me out thought.
It lasted about a second or two. Like I said it was very sudden. I would say it was mild to moderate.
He returned to normal behavior. and I have been watching him closely...
I just dont know what would prompt him to do that at all.