See this post earlier in the thread:
Game Day Thread - Official Post Game Thread - #1 Seed Pats beat the Bills
Bills won the toss. They deferred their choice - meaning giving the Pats the choice of kick/receive or field direction. They chose the ball, Buffalo then chose to give the Patriots the wind in their face in Q1. I think that was a mistake too, but I can understand the logic of using trying to rattle Mac immediately.
So now in the 2nd half, Buffalo has the choice of kick/receive or field direction. They chose the ball, so the Patriots then chose to have the wind in thr 4th quarter. But Buffalo could have chosen field direction (and have wind in the 4th quarter), which would give the Pats choice of kicking or receiving which presumably they’d receive.