LANDOVER, Md.—Two things popped into Byron Leftwich’s mind when he got word at halftime he’d be replacing an injured Ben Roethlisberger as the Steelers’ quarterback.

One was: Forget about listening to Pittsburgh coach Mike Tomlin’s locker-room speech, I need to head out onto the field and warm up my arm.

The other thought? “I truly don’t know the offense yet.”

Well, he knows enough.

Coming in after Roethlisberger got banged up on a 1-yard touchdown sneak late in the first half Monday night, Leftwich led two scoring drives, and Pittsburgh’s defens...

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