Defender setting a moving screen...

[egausch]

When an offensive player screens for another player I would call this a "defensive" move. And isn't boxing out really just another type of screen? Seems to make sense the rules for screens don't differentiate between O and D.
Also, isn't there a requirement for a 5 sec. closely guarded count, before the moving screen is called?
(Sorry don't have rule book with, for a reference)
EG