Obviously as the resident Ravens fan on here, I'm not surprised. They were the #1 seed last year until injuries just became too much to overcome and in that Dolphins game they blew this year, they were down to like the 6th string corners in that 4th quarter, playing a team with 2 burner WR's. Plus, they still didn't have Dobbins back to run the ball (and still don't have Edwards back). It was just a perfect storm to complete the collapse.
That said, the secondary is still banged up a bit, so I wouldn't be surprised at all to see the Bills get a whole bunch of points as this game goes on and make it close. I'd be surprised if they come all the way back as the running game is working today, but you never know especially if the Bills score here right before the half.