We first see them fight off-screen, each of them shouting out a spell and then we see an aftermath of all four of them looking terrified with a big crater between them. At first we think they had a DBZ style beam clash that exploded on contact, but when he finally see their spells in action this terror is unfairly skewed.
Zoboron's power being terrifying makes sense, as he has a gigano sized spell baked into presumably his first spell as he uses it a lot, that is strong enough to destroy Rashield, and he has an upgraded form that's even more powerful.
But Papipurio feels oddly hyped up before we know what his spell actually does. It just hardens like glue and takes a while to work. Zoboron's book owner remarks that he has the power he always wished he had and that "it's simple, yet so strong," and both of them are cowering at THIS?
Come to think about it, when Papipurio gets mad he's too short for a ride and tells Lupa to destroy it, he doesn't even have a destructive spell to accomplish this. The most he could do is stop it, and it wears off after a while anyway. At least later on he actually gets acidic attack spells, but at this point in time he can't actually harm anybody.