Quote:
I know you are not supposed to approach from behind
Says Who? Try it. Approach from behind, stop them but then move a few steps just slightly ahead of them and then continue talking. After you have done this a few times you'd be confident of approaching from behind - the goal is not to look like a stalker

or someone who is trying to stop them from getting to their destination. you can even walk with them as you start the conversation.
Quote:
My question is I'm terrified of approaching moving sets at the mall do to the fact that there are people walking behind you and others that might see you get blown out.
Most girls at malls are strolling. Try approaching them nothing bad happens.