I can appreciate that this is much, much smoother and considerably less sophomoric than Sludgewort's animations, but I must point out that, in such an incision as the one illustrated above, the sternomastoid would severed, the trachea would be partly severed, and the left internal and external carotid artery and the jugular vein would be severed, resulting in arterial spurt at an angle perpindicular to the victim's head, not twin fountains shooting directly upwards.
Good job, though.