Kull strength 12

He bent over the bound king, took him by leg and shoulder to lift him bodily; there came a sudden loud snap as Kull, throwing all his iron strength into one convulsive wrench, broke the remaining strands which bound him. He had not been tied long enough for all circulation to be cut off and his strength affected thereby. As a python strikes, his hands shot to the giant's throat; shot, and gripped like a steel vise. The giant went to his knees. One hand flew to the fingers at his throat, the other to his dagger. His fingers sank like steel into Kull's wrist, the dagger flashed from its sheath; then his eyes bulged, his tongue sagged out. The fingers fell away from the king's wrist, and the dagger slipped from a nerveless grip. The Verulian went limp, his throat literally crushed in that terrible grip. Kull, with one terrific wrench, broke his neck and, releasing him, tore the sword from its sheath.
-	Swords of the Purple Kingdom (chapter 4)