They can be fought, but not defeated.

[ Gerry says that forcefully. It’s important this man understands that. As far as Gerry can tell, defeating the Fears would be tantamount to eliminating fear itself, and that’s impossible. ]

Look, I don’t know what you mean by Grimm, unless you mean to ask if these things are really awful, in which case yeah, they are. [ Gerry sighs. ] Best thing you can do is remind yourself of the people you’re close to. You got any of those, here?