Patriots all year long have started slowly against every team, and then almost always seem to come back in the second half with something like 21 unanswered points. I think the Miami game showed me the entire game is fixed for certain teams.
They’re called half time adjustments, you see what your team is doing well and not, you see what the other team is doing well and not, and you tweak your plan accordingly. Belichick has a long history of being the half time adjustment master, he’s also the rematch master. He learns.