What, I should just give it away? Oh, why not...

I think you have to hit, erm, Blockie and then hit Stoppie. Whatshisname will turn green and get doubled boosts from anything hit for a limited (but not really brief) time.

Oh, wait, there's even different types of Comic Fields! It seems to come down to hitting Blockie and then hitting something else while "vs C.F.F." is displayed.