In Galileo Seven, Spock threw a spear, presumable with a giant in his "sights." With his Vulcan strength he could have killed his intended target.
As I already pointed out above, I disagree with that presumption. It is incorrect that the only purpose for directing fire toward the enemy is to kill them. The other, quite common purpose is covering fire -- forcing them to keep their heads down while your side retreats or makes a move. Given that Spock was quite emphatic elsewhere in the episode that they should fire only to frighten rather than kill, it stands to reason that his intent in throwing the spear was merely to cover their retreat.