There's a method behind Bill Belichick's injury non-answers

“Let your plans be dark and impenetrable as night, and when you move, fall like a thunderbolt.”

-- Sun Tzu, "The Art of War"

FOXBOROUGH, Mass. -- Bill Belichick was in a chipper mood when he arrived at the podium on Wednesday. No, really, he was. He was chatty, self-deprecating and enlightening (if X's and O's are your thing). He was smiling -- well, a couple of times -- and carrying on like a man at the top of his profession, which he is. Just then ...

Can you give us an update on Rob Gronkowski?

In a nanosecond, the sun disappeared and threatening clouds rolled in, turning the New England Patriots' media room into a scene from a Harry Potter movie. Suddenly, it was Voldemort standing in front…