The questin is about Projectiles caused by the Fork-support-gem: http://pathofexile.gamepedia.com/Fork
Will projectiels caused by Fork either have a
- unique crit, (so they could crit when the original didn't crit)
- shared Crit, (so they crit when the original spell did crit)
We have PCoC equipped: http://pathofexile.gamepedia.com/Power_charge_on_crit
So the big incentive: Can these new Projectiles by Fork cause a Power Charge? Thus there was faster gain of Power Charges.