The eagle was intent upon something way up in the sky. The eagle shifted it’s glance and perched thinking. Suddenly it exploded almost straight up off of the branch and into the air. Captain Doug and I both said at the same time “I haven’t never seen an eagle launch straight up like that”. The eagle hovered then leaned over on its right wing, bent around the tree and was gone. FYI the flight sequence occurred in less than two seconds.