Remember how Edea, upon her first appearance, froze Squall and the others? They were paralyzed in time or something.

Then later you stab her in the face and she can't do crap about it.

Then later Possessed Rinoa is "unstoppable" and that's the only excuse I can think of for everyone standing idly by and shouting about her releasing Adel instead of doing anything to prevent it. (she did have some forcefield thing that threw Squall back if you tried to stop her after she leaves the med lab)

Then later Ultimecia herself you can just approach no problem.