Grinder death effect?

[Valtteri]

the death effect is probably just there for when you erase it in the editor, nothing else. Nearly everything else in the editor goes out the same way, so Redigit just programmed it to die that way when erased in the editor.

This is probably the most valid answer. Roto-Disc is the same. In SMBX it too is indestructible, therefore it seemingly has no use for its effect. Also, please don't reply with pictures.

The Roto-Disc's effect is actually used in the game, although not as a death effect. It constructs the trail.

[Squishy Rex]

the death effect is probably just there for when you erase it in the editor, nothing else. Nearly everything else in the editor goes out the same way, so Redigit just programmed it to die that way when erased in the editor.

This is probably the most valid answer. Roto-Disc is the same. In SMBX it too is indestructible, therefore it seemingly has no use for its effect. Also, please don't reply with pictures.

The Roto-Disc's effect is actually used in the game, although not as a death effect. It constructs the trail.

I'm rather aware of that, however, at the time I posted that sentence, I have no idea what I thinking. I've certainly slapped myself that merciless blunder. In any case disregard what I originally said.