Has anyone else noticed that on page 63 JoJo says that Parson is "blocking" magic with the Staff of Suckage...yet on 67 Parson is suddenly concerned about Thinkamancers incapacitating him with spells?
Could this be a continuity oversight, or a glimpse into magic item/artifact mechanics...?
A glimpse into mechanics, most likely. The staff may have, say a 50% or 75% chance to block a spell. Jojo would not risk a 1 in 2 or a 3 in 4 chance of the scroll being wasted.
On the other hand, there are 7 thinkamancers gathered around the portal. If we assume a 75% chance to block, then the odds of all 7 casters being blocked is only 13% - 87% odds of dropping Parson are enough to make him hesitate.