Ohhh, okay. You said "negate" when you really meant "deny". (Negate suggests removing something that was previously there, while deny implies not getting it in the first place.) That's what threw me.What I meant is that the Pursuit kicker damage only happens if the target willingly moves away. If the DM decides not to do that, then the party can't do anything about it; forced movement won't work.
That's true, I agree; on the other hand, a lot of Pursuit powers are specifically designed to drag one enemy away and keep him isolated (Sequestering Strike, Inexorable Pursuit), or to punish other enemies for bunching up around you (Avenging Echo, Deflecting Thunder), so there's that.In this situation, the Pursuit Avenger is going to have to really work to get any bonus at all.
Or you can have a look at the level 15 daily Oath of Divine Lightning. I love no-win situations...