Legolas is capable of fitting and arrow faster than sight

Gimli rose and planted his feet firmly apart: his hand gripped the handle of his axe, and his dark eyes flashed. ‘Give me your name, horse-master, and I will give you mine, and more besides,’ he said.

‘As for that,’ said the Rider, staring down at the Dwarf, ‘the stranger should declare himself first. Yet I am named Éomer son of Émund, and am called the Third Marshal of Riddermark.’

‘Then Éomer son of Éomund, Third Marshal of Riddermark, let Gimli the Dwarf Glóin’s son warn you against foolish words. You speak evil of that which is fair beyond the reach of your thought, and only little wit can excuse you.’

Éomer’s eyes blazed, and the Men of Rohan murmured angrily, and closed in, advancing their spears. ‘I would cut off your head, beard and all, Master Dwarf, if it stood but a little higher from the ground,’ said Éomer.

‘He stands not alone,’ said Legolas, bending his bow and fitting an arrow with hands that moved quicker than sight. ‘You would die before your stroke fell.’

The Two Towers, Book Three, Chapter 2: The Riders of Rohan.