Write a suspenseful scene where the protagonist is being pursued by an unknown assailant through a dark, deserted alleyway

Write a suspenseful scene where the protagonist is being pursued by an unknown assailant through a dark, deserted alleyway. Their heart pounds in their chest as they struggle to outrun their pursuer, unsure of who or what is chasing them. Every shadow and sound seems to be closing in on them, heightening their fear and desperation. The only question on their mind is whether they will be able to escape before it’s too late.