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"Sorry, I'm a loner. I'm not an expert in this friendship thing."
Implied: Bob is frequently compared to a hero in the backstory who went out on a similar adventure and failed to defeat their villain. The backstory adventurer is stated to be a loner.
Deconstructed: It turns out Bob needs his friends to be strong enough to defeat Evulz. Too bad that they're being targeted one by one, and the group is slowly becoming weaker. Furthermore, the Big Bad is strong with the same logic.
Reconstructed: But turns out Bob has learned to fight more independently while under his friends' wings. When the time comes, he can fight perfectly well on his own. Furthermore, Evulz mistaken his allies and associates for friends, making a poor justification for his actions. His "friends" don't work well and are disgusted by his actions and the effects they have. Whereas, Bob and his friends are True Companions who kindly help each other and even the "friends" of Evulz.