This is a stats questions. Imagine team A has a poor FG percentage at half time and team B has a good one, would you expect those rates to convert (mean reversion) or deviate further?
Maybe there is some data to test it empirically.
Sports Stack Exchange is a question and answer site for participants in team and individual sport activities. It only takes a minute to sign up.Sign up to join this community
No doubt that your question should be made in a more specific way. FG% if on an extreme (High or Low), can't be kept consistently along the match - you don't get teams scoring 3pts all the time. So, the initial perceived sentiment, is that it reverts to the mean. I have done this analysis, using Play by Play data, and it checks.