The Unusual Right Index Finger (politics as usual?)

Key points to look for:
Audio differences. While I understand this could have the do with the mics, I’m not 100% convinced that is what we witness in these video clips.
The dreaded finger...






Idk if others noticed these things, but the finger slamming down is weird to me. Especially when it only happens just after finishing the response to the first question, both for Biden and Harris.

Will this become a pattern when journalists get to ask questions?