Here, the white Spy along with the bishop have, through col-lusion, gotten the power to check the King. However, the King can escape check from the bishop by going to e7. Since this square is next to the Spy and is unguarded by ano-ther checking piece (as part of collusion or from another place on the board), white loses via the flipping rule. If, say, a white rook stood on e6, the King could not flip the Spy. The King would instead escape to f7. Remember: The Field Spy only checks the King in collusion with major pieces

in the Field and in collusion,

the flipping rule still applies 

when the square in question is not in the checking path of any other piece. 

​Please see rules on Collusion.