Give your ice a lift

Explanation:

Salt is sprinkled around the thread/stick and salt water has a lower melting or freezing point than pure water. The ice cube melts at the places where salt is sprinkled. Temperature of this water above the ice cube is below 0°C.

When salt dissolves in more of the melted ice, the solution gets more diluted, increasing the freezing point closer to 0°C. As the water has temperature a few degrees below 0°C, it freezes again.