http://boards.cityofheroes.com/showthread.php?t=255676
in the above link it shows how i managed to separate rommy from nictus... i hope it helps 
defiant only
@amartia
my public list : http://cit.cohtitan.com/profile/9355
Another way is to pull the Nictus away from Romulus. If you stand at a certain distance, about 40-50 feet, you can pull a nictus away without Romulus following. Compared to the spawn point, that's more or less the spot with the big circle on the ground. One advantage of this strategy is that you don't need spawn point trickery to make it work, but on the other hand I haven't done the other thing so that one might be easier to manage.
As a DM/Inv scrapper, I would suggest to just try jumping in first. That particular combo could rush and win before the incarnate system, so with the level shift and reactive, it might be a piece of cake depending of your build and how far along you're into the incarnate path. The nictus only does one heal per target, and has to hit the target to heal. With the defense you should have, it shouldn't heal more than one every 30 seconds or so.
So, i've got it into my head to solo the ITF on my DM/INV scrapper, I've no real worries about most of the TF but my only concern is separating Rom from his Nictus as i don't think I'd have the juice to take him down whilst he is being healed.
Is there a way to split them or do you wack the Nictus first?
Any other tips appreciated