follow through

If you are in charge of an after school program and you say to an 8th grader "if you do that again you are going to be in big trouble" and they do it again and you don't do anything but say "stop it" then I am going to want to punch you in the shin.  Especially when they get in a physical altercation and you still don't do anything about it. And I tell you they need a yellow card in front of him and... still nothing.

Yup. Punch you in the shin. Take that, physical altercation.

I like saying "physical altercation" instead of "fight."  Mostly because it seems so stupid.