Fixing Helmasuar's Tail (slightly)

Note, the graphical error is NOT the problem. I'm fully aware on how I can make Helmasuar display the right graphics (changing the Enemy Block set to 21).

Instead the tail spinning around like I want it to, it instead does weird stuff like in this screenshot:

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That on the right side of the room is the tail extending from below the bottom of the screen instead of being behind Helmasuar. For reference on what it should look like, here it is: [You must be registered and logged in to see this link.]