One of the men on the boat, he smells the salt water splashing against the boat. He sees arrows flying through the air as the men on the roof shoot down at him. He hears the men screaming as they shoot back, he hears the waves splashing, the wind blowing against the sails.
He meant that his anger was fuel for him to continue protesting and peacefully disobeying. I agree with this because anger gives a reason to support a cause.