Hannibal's eyes showed anger in them, but they were at himself and not only what had happened. He just looked at Olenna, but didn't argue with her that he had failed Margaery on this.

When Margaery swore that he had stopped Euron, Hannibal nodded. "I pulled him away and removed his cock from his body in time to stuff it down his own throat so that he could swallow his own seed. I ensured that he did not leave anything behind." He said with darkness in his voice and eyes.

He continued to hold Margaery tight. He looked up at Olenna. "He suffered greatly for how foolhardy he was. As did the scum that lived on those forsaken islands." He said darkly.