Do you allow "Inspiring Word" for unconscious targets? Given that its martial?
Orc or Half-orc Warlord: Inspiring Word: "Get up you lazy sack of ----! (kicks fallen companion in the ribs). There's still fighting to do!!" (or pauses to throw a rock at companions head).
Journeymanmage beat me to it, but yeah...Warlords aren't sissy little Bards that sing you a pretty song. They're drill sergeants. Drill sergeants that'll tear you a new one if you fall asleep on the job. Also, for those of you who've seen Gurren Lagann, I always imagine it as a "Let's see you grit those teeth!" moment.
As for the main topic though... Basically, Come and Get It is one of those powers that it might not be good to look too closely at. Just as we don't look too closely at things like
Web or
Healing Strike, and say "they just work", sometimes it's best to just say "hey, it works" and leave it at that. If you start requiring extensive logic and reasoning for every single power in the game, then things will start to fall apart. Sometimes you just gotta sit back and let something work, even if it requires a tad bit of hand waving, and just enjoy the game.
To me, this power is simply the in game manifestation of something that I've seen in 100 action movies, where all of the enemies dogpile onto one of the good guys. They usually rush him all at once, and then in a feat of heroic strength or Martial Arts badassery he knocks them all back/beats them up (see: any Jackie Chan movie). As another poster stated, sometimes this power might just be a representation of the bad guys doing this on their own, or perhaps it's a representation of the Fighter feigning weakness and throwing out a taunt.
Whatever the reason though, it's logic isn't that much more of a stretch than the ability of a naked man in the middle of a completely featureless room dodging a Wizard's Fire Burst (essentially a big 25' wide fireball, also a level 7 encounter power). And yes, I'm aware that you could simply say "Well, the Wizard failed in casting the spell and it fizzled" or some such nonsense, but if it also hit another monster in the room then obviously the spell went off. In which case, what allowed him to dodge? There's no armor, no shield, no cover, nowhere to hide...we just say "You missed", for the sake of preserving the games internal rules, rather than trying to force external logic on it.