S1·E24 Phantom's Hidden Joy!

On the night before the 3rd Battle, Ginta runs into "Tom", who with the Chess Pieces hot at his heels, beseeches the boy's help. However the hunter (who turns out to be Peta) outwits both, and kills "Tom" right in front of Ginta. Leaving the boy with his wrath provoked, Phantom returns from his framed "death" with his head high; Ginta's bound to give all out against the Chess in the future, given they've murdered a 'friend' he's promised protection.