The first photograph in this series is when the Great Blue spotted a Great Egret landing in what he considers to be his fishing territory
Great Blues are very protective of their territory.
He immediately moved over to the Egret.
As soon as he was close to the Egret he struck out. Enlarge the above image and you will see the Herons head between the Egrets wings, he missed but was close.
The Egret was smart to move on.
During nesting season these two will have monumental battles. Egrets are usually no match but at a nest site they are the more aggressive and can be deadly.
Both these birds are top of the food chain predators so this is normal behavior.