"No, I don't...my rage isn't a wild thing I don't have a leash on, it's more something I can sink into when I need to--I'm just fucking scared shitless of the idea of needing to. I need to know that I can let it loose, if the time ever comes, and know that I can come back from it."

It's more like going Super Saiyan or a D&D barbarian rage than that unwanted animal that wants nothing more than to be let out. Especially since Bash has lived his entire life being scared of being angry, mundanely angry, as if allowing himself to experience that emotion is abusive in itself, inherently.