Actually, just touching them blights you, they don't have to bite you at all.

[He raises his eyebrows at the bouncing, then the unexpected circling around him. Whatever the kid's doing, he wants to be able to see it, so he starts to turn around.]

Hey, what are you--h-hey!?

[Goten clearly didn't lift him, they were moving upwards and Riku is very much startled and a little concerned.]

How are you doing that?