They each have their own personalities, perhaps yours is just a jerk, my Ornata is. I tong feed him and he will often act disinterested in the food, and wait until I get my hand within striking distance and go for that instead. I have found they will take a minute between strikes, especially if they caught something. If you need to handle the frog, get him to eat something first, then you will have some time before he feels ready to bite again.