In his rage, Frollo reveals that he killed Quasimodo's mother before their ends with them falling off the Cathedral, but while Frollo falls to his death, Quasimodo is caught by Phoebus on a lower floor, and the three friends reunite.
He killed Quasimodo's mother before their ends with them falling off the Cathedral. This is what Frollo reveals in his rage. Frollo falls to his death. Quasimodo is caught by Phoebus on a lower floor. The three friends reunite.