There are three steps to Grappling:

1) Grab

2) Restrain

3) Pin

To Grapple an opponent, you must have at least one free hand and make a Melee ( Unarmed ) Attack roll, which does no Damage.

With a Successful Grapple roll, that combatant may alter the current Grapple step by 1.

With each new Grapple roll, the difference between the combatants' results is a modifier to the Attacker's next Grapple roll.

Each Round the Attacker must choose to either allocate 1 Action just to retain the Grapple, make another Grapple roll, or let go.

When the Defender reduces the Grapple step to 0 they escape.

Grab

Roll [ Melee ( Unarmed ) vs DEF ] to impose the 'Grabbed' Status.

Hostage

Use a Grabbed or Restrained enemy as Cover.

The Grappled enemy's Absorption acts as the Material Absorption and any excess Damage is applied to the Grappled enemy instead of you.

If the Damage is enough to kill the Grappled enemy, any excess Damage passes through to you.

This does not make you Concealed.

Tackle

Allocate 2 Actions and make a Grapple Attack roll to move up to your Speed and Pin an enemy.

If you Fail, you go Prone in front of them.

Throw

Throw a Grabbed or Restrained enemy up to [ Constitution ] yards.

The target takes 1 point of Blunt Damage to a random Body Part and land Prone.