Talk:Immortal Sword, Durendal/@comment-6881157-20140802153036/@comment-13275021-20140805074814

It has to be done like a Buddy Call, otherwise, wouldn't you just get a Buddy Gift every time you equip Durendal?

If the anime called it Buddy Call, the Bakunetsu Saigen video called it Buddy Call, and they even equipped it as if it was a Buddy Call (by equipping the card from the Buddy Zone), then I'm assuming it's basically a Buddy Call.