Remathilis
Legend
Come and Get It, the power emeritus of the dissociative discussion. And again, it's not "clear", since I think the action economy is abstract and easy to narrate over. Come and Get It is those few seconds where the fighter realizes three orcs are charging him, and readies his blade for a counterattack.
NoNoNoNONO!
What you just described is the textbook "reaction" power: a foe does something and the player/character responds.
If CaGI was written as "All foes within who enter the fighter's threatened area automatically provoke an attack of opportunity" then that would make sense. But it doesn't.
It forces the orcs to charge. It takes the agency away from the character's controller (the DM in this case). It doesn't require the foe to enter to activate, it MAKES THEM MOVE THERE to do it. You can move 6 squares, activate CaGI, and force a foe that was 40 feat away to now engage the fighter in melee
Next, the power itself says "You brandish your weapon and call out to your foes," this implied the character is doing something to activate the power. You. character. How? Taunting (no language keyword, I guess flipping them off could work), mind control (that's magic)?
You can justify any way you want, but CaGI breaks the game assumptions by overriding the DMs control of his NPCs and explicitly says the character is the agent that does this without aid of magic.