The force of your spear thrust can push your foes away.

<php>echo “<b>Prerequisites:</b>”;</php> Weapon Specialization (Spears)
<php>echo “<b>Benefit:</b>”;</php> Whenever you score a critical hit against a creature with a spear, you may push that enemy back 10 ft. This feat does not work against creatures who are more than two size categories larger than you.