[Ravner298]

I could have sworn that I read that Deny the Witch only needs enough successes to nullify enough of their successes to fail. In other Words, if I cast a WC3 spell, and get three successes, and you Deny 1, I no longer have the three successes I need....

Page 25, "you need to nullify all of the warp charge points that were successfully harnessed by the psyker when he passed his psychic test"