This image (left) was captured after the October 12, 2012 game where New England also beat Denver (31-21).
In this moment (above), Manning's facial expression, particularly his mouth and mid-face, is classic for the common combined nonverbal of both Regret (the primary emotion) and Anger (secondary emotion). Some refer to this combination as Bitterness.
In this second image taken after an earlier victory over Manning's then Indianapolis Colts, Brady displays his relative alpha status with his hand & arm turned about 45 degrees so that it is in the dominant, top position (look at their forearms as well). Peyton acquiesces his hand position while accepting the more beta configuration. Had Manning won the game, Brady's hand would have been in the weaker position.
See also:
Negotiation Nonverbal Communication Secret # 1055: The Subtle Lip Purse
Negotiation Nonverbal Communication Secret # 1059: Tommy's Fear Factor and Anxiety
Nonverbal Communication Analysis # 2408: Sen. Kelly Ayotte's Anxiety & Regret via Senators Graham & McCain - Republican Body Language in Response to President Obama's National Defense University Speech
Nonverbal Communication Analysis No. 2505: Marine Jesse Cottle and Wife Kelly Body Language Expression of Regret and Sincere Smiles
Nonverbal Communication Analysis No. 2586: Harrison Ford in "Ender's Game" - Microexpression and Macroexpression of Regret - Harrison's Brand and the Stanislavski Method
Nonverbal Communication Analysis No. 2476: Scandal, Perception and The Bitter "Smile" Weiner, Spitzer and Sanford
Negotiation Nonverbal Communication Secret # 1177: Mitt Romney's Bitter Smile
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