In the silence that followed, a dark flush stained the tan of Corporal's face. "Here", he said at last, "you give this lecture". As if afraid to say any more, he tossed the grenade to the Professor. Quite unabashed, Private Quelch climbed to his ' feet and with the air of a man coming into his birth-right gave us an unexceptionable lecture on the'grenade.
(a) Why did the Corporal ask Private Quelch to give the lecture?
(b) Why was there a silence?
(c) What does the word 'stained' mean?