[He doesn't need to imagine...he knows! It sends them flying into the air and then moments later, their bodies come crashing back down to the ground. Not something you want to get hit by, really.]

Truthfully, the only real difference, apart from the composition of the "needles" themselves, is that it's an attack that always comes from behind. It matters neither which way the target is facing, nor where the caster is in relation to the target.

[So yeah, basically it's Bill's kind of spell.]