Moore can choose to go or not to go in that instance. In the league there are players with many roles and a well understood norm is that you ask a guy if he wants to go and then the guy either accepts and fights or skates away. You then have the right to call him 'gutless' or a 'coward' both on the ice and in the media. You also have the right to engage their enforcer on your next shift.
This norm of "old time hockey" is what allows the Phil Kessel's, Henrik Zetteberg's and Pat Kane's of the world to do what they do without fear of imminent death on the ice (see: Flyers, Philadelphia "Broad Street Bullies" era)
If a guy (particularly a non-fighter) refuses to go you call him several unprintable names then skate off confident in the notion that on your next shift you absolutely will get to fight somebody. "Old time hockey".
Also, fighting doesn't happen here in bantam or midget (well, not unless you want a serious OHA suspension/reprimand and your coaches to enjoy a few meetings). Once you get to juniors it is open season (but with the unstated norms as above).
Bertuzzi knew about this, he's from Sudbury fergodsakes.