Steelers QB Ben Roethlisberger had an emergency appendectomy Sunday, and their backup QB Charlie Batch isn't exactly awe-inspiring, as evidenced by the line moving like crazy. The Mansion line is now at pick 'em (or pk, or pick), which means that there's no point spread built into the line now, and you're simply picking the Steelers to win, if you still haven't locked in the free bet on the Mansion side. (It's technically still a point spread bet, it's just one in which the point spread is set to 0, which is displayed as "pk", etc.)
Pinnacle has it at +1 Dolphins, but the most you could move the line is to +2.5, nowhere near what you need to hedge the Mansion free bet if you locked it in earlier at -5 or -4.5 Steelers. When books start to post their lines for the game, it'll likely be in the pick/+1 territory, so hedging is pretty much no longer an option if you've already locked in the bet.
If you haven't locked it in yet on the Mansion side, congrats, as they just put the promo back on the site, and you can take it at Steelers pk and hedge to your heart's content, when other books start posting their lines for the game.
Can't say I'm really happy at all with letting the bet ride with the Steelers -4.5 at this point, as their QB situation is pretty damn dreadful, but it is a free bet, and they play the games for a reason.
Dude, Steve Irwin got killed by a stingray?