For handling Umbridge, simply have Doug make use of the blood card.  Pottermore shows she's a half disguising herself as a pure.  Albus would be happy to hint at the scary parallels between Dolores and Tom Riddle, which just adds fuel to the fire.
	
	
	
Canadian lighthouse to U.S. Warship approaching it:  "This is a lighthouse.  Your call!"
	

 
 

 
