1.)
Stand there
Press F1 to raise hands
=> fists are raised
Stand there raising fists
Press F1
=> fists are lowered
2.) Run with gun on back and another rifle in hands
Switch to melee weapon on back
=> very often, character will pull melee weapon and immediately put it back
3.) Go third person
Lie down prone with rifle in hands
Aim rifle (not down iron sight but just to see character looking down it)
Switch to pistol
=> character stands up