Witnessing Yugi’s sacrifice, Joey finally shatters Marik’s mental control. He uses the second effect of "Meteor of Destruction" to force his Red-Eyes Black Dragon to attack himself, also reducing his Life Points to zero to ensure Yugi's safety.
Note that "Episode 78" refers to different plots in other Yu-Gi-Oh! spin-offs: Watch S02Yu-Gi-Oh 78
Yugi decides to save Joey by using the trap card Mystical Refpanel to redirect the damage from "Meteor of Destruction" to himself, bringing his Life Points to zero. Witnessing Yugi’s sacrifice