I"m not 100% sure about the discipline stuff, but I can say this, I find this year has been more rough than any of the previous years i've played.
For a gentlemans league, there's an aweful lot of pushing, shoving, grabbing, elbowing and even tackling.
I try to play fair, but it seems that there are some people that play soo hard that you need to shove them back otherwise you get hurt. (the thing is, they don't even realize they're being rough)