The replicator in the Reunion was able to resist 2-3 shots of wraith stunners without even flinching. How was it that he was caught in the first place? For one the wraith don't have any other kind of weapons that could "knock out" a replicator. Can't exactly feed on him. Don't think the wraith just grabbed onto him and threw him into the force field. The replicator is far to powerful to be overwhelmed in hand to hand combat.