>>724491623
>>724492268
The wand without the light is casting the whole wand with each shot
With the light, it tries to cast the light spell, but as it has no projectile attached to it, it wraps to the front of the wand and starts casting every spell again till it finds a projectile
This causes the light wand to effectively cast the whole wand twice before reload
In this example, the bifuricated formation is calling for two spells to cast, does not find them and so casts the start of the wand again, causing the whole wand to be cast twice before reload.