Another meat hook? ... Well, at least it's not an Omnislash

..
or a Kamehameha
First of all, you have a lot of leaks .. sort of ;p
Over here:
-
Unit Group - Pick every unit in (Units within 300.00 of (Position of (Triggering unit)) matching ((Picked unit) Not equal to (Attacked unit))) and do (Actions)
-

Loop - Actions
-

Animation - Play (Attacked unit)'s spin animation
-

Unit - Cause (Attacked unit) to damage (Picked unit), dealing (100.00 x (Real((Level of Counter Helix for (Attacked unit))))) damage of attack type Spells and damage type Normal
-

Special Effect - Create a special effect attached to the chest of (Picked unit) using Objects\Spawnmodels\Critters\Albatross\CritterBloodAlbatross.mdl
-

Wait 0.09 seconds
-

Animation - Play (Attacked unit)'s stand animation
-

Special Effect - Destroy (Last created special effect)
You're leaking this group.
To fix it, create a Custom script above the "Pick every unit...."
In the custom script, paste this:
set bj_wantDestroyGroup = true
and also, remove that wait .. it's useless.
If you want the effect to work, create a new loop trigger
that loops every 0.03 seconds.
You'll also need a new integer variable to use as a counter.
Everytime the trigger runs, it will increase this counter by 1.
When the counter hits 10, then you'll play the caster's stand
animation, and the loop will turn itself off.
This loop trigger will be turned on after you play the attack
animation, create the effect, and deal the damage.
If you're asking why I'm telling you to make the stand animation
play when the counter is 10, it's because 10 in this case corresponds
to 0.30 seconds.
You can change the counter value at which the animation plays and
the loop turns off to any value you want, depending on how long
you want the attack animation to play.
------------------------
Now about your meat hook spell:
It isn't MUI
You need to make it so that any number of Pudges on the map
can use this spell without it bugging.
Also, another thing, make sure those chains have 0 collision

If they had any collision, it would bug (try hooking a tree ;p)
To make the spell MUI, you should learn a good indexing system (Try the forums)
I couldn't elaborate anymore on how you can fix the meat hook spell for now
I'm kind of busy right now, so Good luck