Who killed Scragga and how?

From the text:

"The moon is dying—the white wizards have killed the moon," yelled the prince Scragga at last. "We shall all perish in the dark," and animated by fear or fury, or by both, he lifted his spear and drove it with all his force at Sir Henry's breast. But he forgot the mail shirts that the king had given us, and which we wore beneath our clothing. The steel rebounded harmless, and before he could repeat the blow Curtis had snatched the spear from his hand and sent it straight through him.

Scragga dropped dead.