Tackle
From Wolfire Games Wiki
This unarmed combat move is executed by Rabbit Running at an enemy and pressing the jump key when close. Successful performance usually rewards 5 points the first couple times, diminishing every time you do it again. On higher difficulties, or simply when an enemy is aware of you, they can throw you off themselves as a reversal, which in turn can be counter-reversed. The tackle does very little damage, if any, but the bonuses are that you knock them prone and you can disarm them in the midst of the move if they are carrying a weapon.