Magnets, how do they blend?

Before I get to why they've been banned, I just want to point out that whether these are sparks or just glowing-hot shards of magnet, you can see that the flying pieces do not follow straight lines. Not only are they being knocked around by Tom's infamous Blendtec blender, they're moving along the magnetic field lines present in the blender. You can't blend field lines.

Sources: Blendtec