Film: How a thinned Vikings' front was gashed by Bears' Montgomery, Trubisky

Before Sunday's 33-27 loss to the Bears, Vikings coach Mike Zimmer said his staff's preparation included looking through every snap their teams had taken against quarterback Mitchell Trubisky.

But Bears coach Matt Nagy arrived at U.S. Bank Stadium with a plan to attack through running back David Montgomery, building Trubisky's throwing lanes with more play-action bootlegs than the Vikings have ever seen from Trubisky in their seventh meeting.

While the Vikings were expecting plenty of Montgomery on Sunday, the Bears opened the game with Trubisky bootlegs in football's version of an off-speed pitch. It's not dissimilar to how the Vikings offense has taken advantage of overeager run defenses.

And…