Another stupid question

Basic training, 1964, Fort Polk, Louisiana. D Company sitting in stands at hand grenade range, listening to instructor describe the M26 hand grenade. At the conclusion of his class, the sergeant asked: “Are there any questions on what I have covered this morning?” Pv1 Dufus stood. “Yes, Sergeant. What is the angle of deflection when the hand grenade detonates?” Sgt: “Pardon?” Pv1 Dufus repeated the question. Sgt: “The grenade detonates in 360 degrees.” Pv1 Dufus: “Thank you, Sergeant.” He sat down. “The angle of deflection.” After 49 years, I still do not know what Dufus meant. Neither did the sergeant, but he gave an answer that sounded reasonable. Dufus didn’t want an answer, anyway; he just wanted to hear his voice.