See it gives off the feeling of elder teaching young'un.
Biden is IN the body of the nation's government. It reinforces that he is part of a responsible thoughtful careful governmental body.
Ryan comes off like a brat who would totally wreck the place with his carelessness & irresponsibility.
You talk against the stimulus & beg for it at the same time?
Biden spoke from an edge of experience & schooled this unprepared brat in front of the whole world.
Sensei showing Grasshopper why he's not ready for the big time yet.