You Have an Island

You say that we're friends
I don't want us not to be
How is it defined?

The wind says we are
The stream floats us together
It feels like we are

Do we know at all?
Besides that we're together
We are not the same

You have an island
I have one almost exact
We kill each other

It's about Boom Beach
The Task Force I left behind
Still I call you friends