How come when a guy sees you and gives you a compliment, he always has an escape route to keep you curious or wanting more?

I was walking from the garage the other week when i saw a guy looking for an energade. ( I think ) ... he looked at me once and then he looked at me again with an expression of ... well ... blankness and curiosity. before i could say hi or smile at him, he had already reached for the door.

i guess my question is? what is your guy's first option of a move if you see a girl you think is really hot or you might be interested to go out with?

and do you think its weird if a girl asks you out first?