spamming spell problem!

[Scorre]

Hello! Iv'e got a problem. The problem is when i cast the spell two times (the spell looks like elunes arrow but it is not a arrow it is a snowball) will the first snowball stop moving. i wondering how i fix it.

Scorre

 

[Flare]

1) Wrong section, this should be in World Editor Help Zone

2) That's because the spell isn't MUI (and would be a pain in the ass to solve, if the spell is made in GUI)