Forum:Scattershot and Blaze accelerator

rulings about Volcanic Scattershot and Blaze Accelerator
 * Volcanic Scattershot: If this card is sent to the Graveyard for the effect of a "Blaze Accelerator" card, its effect to inflict 500 damage to your opponent does not activate.


 * The effect "inflict 500 damage to your opponent." of other "Volcanic Scattershot" cards sent to the Graveyard as a cost to activate the effect of this card will activate. Their effects will go on a new Chain after the resolution of "Blaze Accelerator" or "Tri-Blaze Accelerator".

Anyone knows why the scattershot sent bye the effect of blaze accelerator can't inflict damage when is sent to the graveyard? at first i tought that was because the scattershot was sent by effect, not by cost, but then , the effect of Volcanic Scattershot can send 2 other Scattershots from hand or deck , and they will do the damage when sent to the graveyard.(even though they are sent by the effect of the other scattershot)

also, the effect of Tri-Blaze Accelerator is practically the same as Blaze Accelerator (send a piro with 500 or less) but the ruling says nothing about sending scattershot , so , that means if i send a scattershot with Tri-Blaze Accelerator , it will do the damage when sent to the graveyard. so, this ruling made me confused...