In "Gland of the Mimikar", Gwizdo storms outside to brood, as Lian-Chu is slowly being poisoned. He wants to help, but he doesn't know how.
Later in the episode, Lian-Chu has collapsed after Hector got the last of the Mimikar's gland into his mouth. Gwizdo thinks that they've failed.
Gwizdo: Lian-Chu, without you I'm useless, a total loser! I'll never make it on my own!
The look on Lian-Chu's face when he thinks that Gwizdo left to become a hermit in "Prince Charming!" (The truth was, Gwizdo was kidnapped by Prince Charming's minstrel, and left bound and gagged in a closet in his own bedroom).
In "The Family Fortune", while Gwizdo, the Richmonds and Haskell are freezing in the Freezeasaurus' pond, Gwizdo confesses to Lord and Lady Richmond that he pretended to be their son to con them, but realized that he really is their son. Before he finishes talking, Lord and Lady Richmond see their actual son floating by and move in towards him. Gwizdo thinks that they're moving in to hug him, but Lord Richmond pushes him out of the way, leaving Gwizdo to freeze alone.
The Movie:
Gwizdo leaving Lian-Chu complete with gently melancholic Jalan Jalan's musical composition Lotus. He does this by painfully convincing himself that he will remain useless and misunderstood in the team, but, finding himself alone on a broken slab in the middle of the abyss of a bizarre twilight sky, he realizes that he acted recklessly, and now his options for action are extremely limited.
