Some weapons are capable of disarming. These include the spetum and khopesh.
A combatant being disarmed can save vs petrification to avoid the disarm, but this does not negate any other effects of being hit by the weapon (damage, etc.).
A combatant must spend one round recovering a disarmed weapon before being able to use it again.1)
We do not use the full UA disarming rules – only the above weapons are able to be used to disarm, and they can do so while simultaneously attacking. However, we do apply the saving throw, as seen above.