Talib went out early, the Ravens didn't really take advantage of that for the rest of the half, then someone must have said something during halftime like, "Hey, Talib is OUT! Let's start picking on the softer coverage!" and Flacco picked them apart in the 2nd half. The Welker drop and Ridley fumble only compounded things.
If you're looking for parallels to this year's home AFCCG, I guess you should pray that Butler doesn't get hurt as I suspect the Pats will adjust coverage, but be overall softer in the secondary.
Regards,
Chris