I've always assumed that when you see a big jump in a 2nd half line it's safe to assume that's sharp action causing that jump. The reason I assume this is because I know there are pros that specialize exclusively in 2nd half betting. By a major 2nd half move I'm talking about for example a total that opens up at 20.5 and jumps to 23 within seconds. I'm having second thoughts that this is mostly sharp action moving these lines and maybe in fact it is just square/public action moving the line. Any feedback would be appreciated.