Your code won't always detect if a projectile was thrown.

-Enemynear redirects to the nearest enemy not the nearest helper/projectile.
-Enemy,numhelper > 0 might seem like it's working for some characters but that will trigger for any helper, not just projectiles.

I recommend giving that system I linked a try. It's simple to add to any character, It will do exactly what you are wanting and your code would look something like this:

Code:

[State -2, Remember Enemy just throw a projectile]
type = varset
trigger1 = PlayerIDExist(helper(33333333),var(3))  ; enemy helper projectile detected.
trigger2 = numproj > 0
var(44) = 1