I took a Concealed Weapon Permit course back in the early 90's that emphasized the very strategy you describe. The only difference was the use of four five dollar bills. Just fling them on the ground and while the potential aggressor was distracted and scurrying around picking up the cash you made your getaway. It was also part of a legal defense – it demonstrates an attempt to avoid the use of a gun, and if the aggressor continued aggressing it demonstrated his/her resolve for violence.