What's going on with Biden ?

[CremeFresh]

Looks like he thinks there's a chair behind him. Hes then seen leaving with a staffer running after him
https://x.com/chesschick01/status/1798705370023821812?s=46&t=zeqvo7Iw1m8V4kXAX7nn1A

He went to sit down, his wife signalled it was not appropriate t that tine as everyone else was standing and a speaker was just announced so he stood up again.