Bills left some plays on Offense in the 1st half. I remember them having a chance (maybe Coleman?) late in the 1st half to pull closer but couldn't. THe most important thing is the Ravens and Texans effectively beat the O-Line, something we rarely see. It does appear that the O-Line has adjusted since then.
On Defense: missing the LBs and the run support CB hurt a ton. The Ravens O-Line played better than they normally do.
Still imo it came down to the trick play. Bills had the momentum and completely reversed it. The Ravens are definitely a team that can get into their own heads and struggle. Lack of solid coaching imo