I want to raise a question to all the 4th Edition Dungeons & Dragons DMs out there: how do you handle marked monsters and NPCs on the battlefield? Do they "know" they are marked? Do they just keep attacking whomever they please (and suffer the consequences)? Do they change targets and focus on whoever marked them?
Here's the problem: in my campaign I have a 'cardboard' character who is the only fighter in the party. His name is Crush. In strict 4E terms, he's the 'defender' of the group and since I'm the DM as well, I have to play him kind of ... you know... dum dum. The problem I run into is when he marks a target using his class feature Combat Challenge. I usually just have the monster he marked change focus to attack him instead, but my wife raised the question the other night "Why does that zombie have to attack Crush? Maybe he doesn't care that he's marked... i mean.. he is a Zombie, right? Muhhhh Bwraaaaaiiinzzz...."
... Admittedly, my usual choice may be residual fall out from playing too much Warcraft for the last 4 years (thank the gods I quit) ...So... since 'marking the target' is a relatively new concept in D&D, how do you handle it?