If the player has no weapon equipped in the primary inventory slot, then the player will fight with unarmed combat when attacking. When fighting with this type of combat, the player will have 2 types of "moves".
The first move is a simple push, deals no damage to the target and prolonged fighting will tire out a player. However, if an unarmed push successfully hits an enemy, the target(s) will be pushed back and may even fall onto the ground. This attack can push up to 3 enemies at once (one of the few "weapons" in game that can target 3) and if the attack is charged more, the enemies are pushed more.
The second move is a stomp to the head. This only works if the enemy is knocked down on the floor. Unlike the "push", this attack deals damage to the enemy, although it still takes many strikes to kill a downed foe. This also prevents a downed enemy from getting back on its feet, which is very useful in a 1 v 1 situation.
The best strategy is to push a standing enemy to the floor with one well-charged push. Then, the player should try to stomp the enemy repeatedly in order to prevent the enemy from getting back up and in order to kill it. Unarmed combat in general will expend energy very quickly because the attacks are very weak. This should not be attempted if there are many enemies because it takes a lot of time to kill an enemy. Instead, fleeing is usually more viable. A weapon is also far more powerful than unarmed combat and should still be obtained as soon as possible.