First of all I try not to go somewhere deserted but if anytime i will be in a such situation i will try my best to stay calm an say all my prayers(duas) at once call the police and then will turn around to see if there's someone behind me. If none than its good but if there's then i will ask him if he needs any help (remember I'll try not to sense anxious) i hope he will stop chasing me but if not than its my luck.