If Giants repeat this late-game blunder, it could cost them

Brad Wing was charged with a costly facemask on Willie Snead which cost the Giants a chance to force overtime in last season's loss to the Saints.As Zak DeOssie recalls, it was a “terrible ending’’ for a very specific reason: “Everything that could go wrong went wrong.’’

But, DeOssie added, “I wouldn’t necessarily call it shocking.’’

That is not the majority opinion.

“It was a shock to everybody,’’ Tom Quinn, the Giants’ special-teams coordinator, told The Post on Thursday after practice. “We kind of created those last year for ourselves.’’

Creating such mayhem drove the Giants into the darkness of a second consecutive 6-10 season, darkness that for now has brightened with the season-starting…