I'm saying that whether its a single model or not, its not targeting the model, only 1 part of it.
if it said, anywhere in the spell anything about a model, I'd agree with you, but it doesn't, and you've provided no rules based evidence about anything that targets JUST THE CHARACTER from suddenly targeting the character, AND this other target as well.
Is it 1 model, yes
Can you shoot them separately, also yes, although, not always directly(see oxyotl's snipe et all)
Can spells affect both of them separately? also yes, although most that do, generate some effect that is shared by both aspects of the model(terror, stupidity etc)
What you seem to be forgetting, is that while its 1 MODEL, you aren't targeting both parts, your targeting 1 part, and not a art that gains any benefit from the spell.
I would also appreciate a little grammar control please, I take the time, please do the same.