Cactus Dan

Hello there legendary Cactus Dan,

I have an interesting predicament. I've rigged up the cephalic fin of a manta ray and need to bend the bones up into a roll like in real life. I've got all the joints there nicely but can't seem to figure it out. Using a goal won't work because it won't rotate the joints along the axis progressively if that makes sense. If you have any idea how this can become a reality I'd greatly appreciate some advice. Below is a screenshot that should help explain what I'm referring to.

Cheers!