I really don't like the static difficulty for Terrify, especially when it is combined with Intimidating. it becomes very easy to do for only a few strain. As far as I can tell, the only way for a target to make it more difficult is to have ranks in Intimidating themselves.
Does that make sense? Obviously I don't think so. For one thing, it ignores the normal rules for Coercion where Coercion is opposed by Discipline. A small child (low Willpower/no Discipline) is just as easy to Terrify as a Jedi Master (high Discipline and Willpower). Further, a talent like Confidence that makes fear checks easier to overcome doesn't make you harder to Terrify, which doesn't make sense either. Terrify is a talent that relies on fear and intimidation, but exists separate from the normal rules for both.
The only reason I can see for that is that it targets multiple people, and the designers were reluctant to try and devise a way to set the difficulty based on some combination of multiple Discipline skills. That's a very meta and disappointing reason for the talent to work the way it does. Perhaps it could work sort of like Auto Fire, where you pick certain targets prior to rolling and then the difficulty is the highest Discipline skill amongst them.