This is very sad & difficult to watch. (Warning in advance) Especially in light of the current announcement of dementia. Many of us are in debate over what we saw dementia or otherwise. Very sad & heartbreaking no matter how you look at it. Wish I never went to this concert but I did & this is what I saw. You decide. He left, no encore, we were too much in shock to yell for him back. This may be the last time we see David singing this song & he tells us he loves us too. Wishing David my best.