How could Edward attend a human school (where paper cuts; and other skin damage from fights and sports is an absolutely everyday activity); if a small papercut with a single drop of blood on Bella drove Jasper totally insane with bloodlust?
For that matter, why did Edward not try to go for Bella the same way Jasper did; and protected her instead?
I took the little package, rolling my eyes at Edward while I stuck my finger under the edge of the paper and jerked it under the tape.
"Shoot," I muttered when the paper sliced my finger; I pulled it out to examine the damage. A single drop of blood oozed from the tiny cut.
It all happened very quickly then.
"No!" Edward roared.
He threw himself at me, flinging me back across the table. It fell, as I did, scattering the cake and the presents, the flowers and the plates. I landed in the mess of shattered crystal.
Jasper slammed into Edward, and the sound was like the crash of boulders in a rock slide.
There was another noise, a grisly snarling that seemed to be coming from deep in Jasper's chest. Jasper tried to shove past Edward, snapping his teeth just inches from Edward's face.
Emmett grabbed Jasper from behind in the next second, locking him into his massive steel grip, but Jasper struggled on, his wild, empty eyes focused only on me.
(Twilight: New Moon)
Canon answers only please.