Stonefur has the audacity to defy Tigerstar himself when surrounded by nearly two full Clans of Tigerstar's supporters. Ordered to prove his loyalty by murdering his own apprentice, he instead challenges Tigerstar to kill him. Darkstripe attacks on Tigerstar's orders, but Stonefur, who, it should be pointed out, is starving and greatly weakened, defeats the well-fed and rested warrior in combat, and is only killed when the strongest warrior on Tigerstar's side steps in to help.
The Darkest Hour contained a lot of these, from Bramblepaw publicly announcing that he would rather die than join his tyrannical father, to Firestar fulfilling his prophecy and defeating Scourge, the cat that killed Tigerstar nine times with one blow... after already having died at Scourge's claws.
Scourge: "How!? I killed you!"
Firestar: "You did. But I am a leader with nine lives who fights alongside StarClan. Can you say as much?"
Scourge gets a CMOA when he rips out ALL NINE OF TIGERSTAR'S LIVES AT ONCE, and followed with this in the Rise of Scourge manga: "My littermates said I was too small... too weak. But I've proven them wrong. I've learned how to be strong...how to live for blood. Because that's the key. The only answer. I am leader of BloodClan. I am Scourge. AND I HAVE WON!"
Tallstar refusing Tigerstar's offer in the Darkest Hour.
Graystripe's deputy ceremony on the field of battle.