There are already 6 goals (Real Madrid 4-2 Rayo Vallecano) before the first half is over. The live betting odds go crazy now, over 10 has an odds of only 1.65 atm.
I don't think we'll see 5 goals in second half. Matches like these usually end up with less goals. There are already 6 goals at half, I remember a lot of games that teams stop scoring and wait for match to finish.
This is an opportunity for them to score alot of goals to catch up with barcelona incase they have tied points. If they dont go all out for now then they will probably dont have other opportunity to score more goals, I think we can see atleast 3 more goals at the second half later