Luffy may not be the smartest pirate to sail the seas, but my goodness can he see through people. He is able to look past the apparent form and understand what lies beneath hidden away. Sanji was doing his best to find an outcome that saves the most people, even if it meant sacrificing his own dreams in the process. Luffy understood the hollowness in Sanji’s comments as well as the pain within his kicks and chose to continue believing in Sanji. As much as Sanji wanted Luffy to leave, Luffy knows he needs to stay. Their bond has not been severed. And Luffy knows Sanji does not really want to sever their bond.
Buried under the rage of negativity, feelings of camaraderie and respect blur into obscurity as the meaning of a guild loses itself under the weight of that animosity. Natsu and Gray have cast themselves into their primal rage and through that submerged state, they lost sight of the bonds they share. Carrying the teachings of Makarov and in essence, Fairy Tail, Erza pierces through their hostility reminding them of the bond they share. Through her pain and resonance with Makarov’s teachings, Natsu and Gray come to escape the destructive states they found themselves in.