Forum:Fortress Dragon Q

This part confused me "You can only Special Summon this card from your Extra Deck by sending the above cards from either side of the field  to the Graveyard. " Does that mean I can even use my opponents machine monsters as a fusion material? Even when their still on his side of the field? I mean what's the point of "EITHER SIDE OF THE FIELD" ?Aznskills90214 00:38, April 22, 2010 (UTC)