They can be "done right" with bands or cutting.  And they can be "done wrong" with bands or cutting.

And just for those who follow Carlsoncl's technique literally, so you won't end up with a dead steer, he said "vein" but I know he meant artery!!  It is the artery that pumps the blood on the ground, not the vein.  Focus on the artery, especially on the big ones.  This is where the spinners have an advantage.  They get both (with the nerve) without even trying.