Thunderstrike Gauntlet

The Strength of this attack is always equal to the Toughness value of the
                Monstrous Creature, or half the front Armour Value of the vehicle being hurled
                (rounding fractions up)

If an Imperial Knight fighting with a weapon with this special rule
                destroys an enemy Monstrous Creature or Vehicle in the Fight sub-phase, it can
                choose to hurl it (Gargantuan Creatures, Super-heavy vehicles and buildings cannot
                be hurled). If a vehicle was destroyed as the result of suffer in an Explodes!
                result on the Vehicle Damage table, resolve any damage before hurling it. Any
                passengers must make an emergency disembarkation before their transport is hurled.
                To hurl an enemy model, immediately resolve a shooting attack against an enemy unit
                within 12” that is not locked in combat using the Hurl weapon profile. A hurled
                model is removed from the battlefield after the attack has been performed.