The 3rd picture:the crowd were rushing

to form a line behind the kid.  The kid's ass is not as muscular as the 美国兵's however.  Some people decided to run away from the scene so they can find another 美国兵's ass, while the other cool dudes stay to take care of their own business. 

Nobody in the picture was panic except the fortunate kid.  Maybe he was too excited that he can finally kiss sombody's ass in front of camera.