You are in a crowded marketplace when suddenly, you bump into someone and their mysterious package falls to the ground

You are in a crowded marketplace when suddenly, you bump into someone and their mysterious package falls to the ground. As you pick it up to return it to them, you notice it is leaking a strange, glowing liquid. The person hastily grabs the package back from you and dashes away, leaving you with more questions than answers. What do you do next?