It's just an extremely hostile environment, clearly the most intense stadium in the league. So even if the Chiefs arent playing well, the crowd so often just drag the Chiefs home. Obviously Mahomes/Reid are part of that as well, but the number of double digit comebacks we have had over the years at home make it clear the crowd have a huge part to play in intimidating the oppostion.
I think yesterday the Chiefs expected to just have to go through the motions against the Raiders which is why it was so close, and definitely overlooked the Colts who are the only loss on the season.
We took Tampa Bay seriously and blew them away. There is 0 chance of us being casual in approach aginst the Bills, so that works in our favour as well.
All in all though, I just think the Bills if they are focussed, will have too much for us.