- "ENOUGH!" bellowed Harry, who had seen Ginny glowering in Ron's direction and, remembering her reputation as an accom-plished caster of the Bat-Bogey Hex, soared over to intervene be-fore things got out of hand.Chapter 14 -- Felix Felicis (51% in)
- But has either of you found out anything?" he has-tened to ask, before Hermione could intervene again.Chapter 21 -- The Unknowable Room (20% in)
There are no more uses of "intervene" in Harry Potter (#6) and the Half-Blood Prince.
Typical Usage (best examples)