[PGR88]

As with the campaign, we will not see Biden for at least 3 or more days now.

I think they get him ready for such events by pumping him full of drugs, so his body needs several days to recover

[RoosterRedux]

Or they filmed the speech over an entire day (or two) and then sliced and diced the "film" until they got what they wanted.

Also, CGI is pretty incredible nowadays. If they wanted Joe to look more commanding and forceful, they could have done that too.

[Kevmo]

good point