I think what happened was kobe wanted a towel, but didn't want the top towel (just like you don't want the top lid for a self serve drink). So when he reached down to pull the second towel from the top, the momentum from pulling the towel pushed the towel on top up towards the lady. You can see that he has another towel in his hand... and uses it to wipe himself down before giving his wife and two daughters kisses. Kobe was in a bad mood because of making only 3 of 10 free throws.
