Guardian Eatos:
If you have no monsters in your Graveyard, you can Special Summon this card from your hand. You can send 1 Equip Spell Card equipped to this card to the Graveyard to select and remove from play up to 3 monsters in your opponent's Graveyard. This card gains 500 ATK for each monster removed by this effect, until the End Phase.
Calamity's Armaments:
The equipped monster loses 600 ATK for each monster you control. When this card is sent from the field to the Graveyard, you can select 1 face-up monster your opponent controls and equip it with this card.
When I equip Calamity's Armaments to eatos and activates eatos's effect by sending Calamity's Armaments to the grave, would I be able to re-equip Calamity's Armaments to a monster on my opponent's side if I wanted to remove monsters from opponent's grave from the game? Or in order to keep Calamity's Armaments on the field, I have to choose 0 monster to RFG?