Druid/Shaman Question

I think my question is more around the interactions between those two very different forces.

If a shaman calls on the elements to bring a storm down on a druid, and the druid turn calls that same storm to calm. Who does it obey?

They both have crossover in the realms they control but through different methods. It’s probably not a question that is easy to answer but I want to understand how differently they control their domains.