Forum:Mermaid Archer Qs?

Opponent's Turn: summons Deep Sea Diva and activates its effect to special summon Mermaid Archer then he equip Deep Sea Diva to Mermaid Archer

My Turn: Set two face-downs

Opponet's turn: summons Armed Sea Hunter then he decided to Synchro it with the equiped Deep Sea Diva, which is a tuner, into a level 6 Synchro Monster. (is this a legal move?)