when, as a rook, I dive into a bish/knit fight? 
No, diving, whether into a fight or elsewhere, is merely a maneuver.
BTW, next time you go to an "all you can eat" restaurant, I recommend you eat, then go back for seconds, pile your plate high, and spit on the food and leave.
If the manager stops you with some smack about, "hey buddy, it says all you can eat, not all you can
waste", respond with, "it says all I
can eat, not all I
did eat."
He'll back off in deference to your obvious rhetorical skills.