As many of you know, the current animation for Corpse Spider is that the WD throws a jar of spiders at the targets, jar breaks and then the spiders proceed to attack nearby foes.
As I was watching some vids and reading articles (old ones) I found out that it had different animation back then. The WD would summon a zombie from the ground and that Zombie spits out (or vomits o.o) spiders.
None of the runestones on the calculator leads me to believe that that was rune effect so I'm guessing Blizz changed the animation. I don't know why though.
I personally prefer the older animation with the vomiting corpse. I think it just fits more than the jar throwing.
Which one do you guys prefer?