The bald eagle needs the squirrel. The mouse needs the squirrel. The squirrel sees the mouse. If something chases the bald eagle and it is red then it sees the squirrel. If the squirrel is not red then the squirrel sees the mouse. If the bald eagle is green and the bald eagle does not need the mouse then the mouse does not chase the bald eagle.
The bald eagle does not see the squirrel.