Worst plot device EVER

I just don't know what to say about this one.

All of a sudden, Ginji stopped dead in his tracks.

“B-Ban-chan! SHIDO! I CAN’T MOVE!” he half-whispered, half-yelled.

“Ginji… don’t try to struggle.” Ban moved toward Ginji and as soon and he was within two metres of the other Get Backer, his foot stuck fast and could only move very slightly.

“It’s a very, very powerful magnet, Ginji. It’s holding us down by the iron in our blood.” -- Itsumo