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Sounds really hinky and I too would suspect ill intent. The situation looks to me like he was planning something, maybe only asking you for a ride but didn't have the courage to approach your car so the actual threat level was pretty low. If he didn't have anything in his hands rolled windows and the locked door would protect you. Your response was appropiate.
Also most likely don't need to say this as most people on this board are paranoid but never give rides to strangers.

One time I admit to being lost in my own thoughts at a red light and had a panhandler approach from blind spot. Scared me so bad I almost reached for the gun.