it doesnt work that way, due to the fact that lightpulsar is being tributed his effect does not go off, and the same for heliopolis. lightpulsar must be "destroyed" or "sent" as the final resolution to an effect. when dark hole kills them both the last activation is lightpulsar which is why he can summon d-metal but in the instance listed above light pulsar misses timing in all 3 instances. its just like why you cant use light pulsar to synchro with and get d-metal back. (ex) dragunity phalanx and lightpulsar on field, synchro for scrap dragon, grab d-metal, d-metal grab pulsar, scrap hit pulsar and opponents card, pulsar effect grab another d-metal, summon pulsar. 28,28,28,25. Konami issued a miss timing rule with light pulsar dragon.

It doesn't work that way, due to the fact that Lightpulsar is being tributed his effect does not go off, and the same for Heliopolis. Lightpulsar must be "destroyed" or "sent" as the final resolution to an effect. When Dark Hole kills them both the last activation is Lightpulsar which is why he can summon D-Metal but in the instance listed above Lightpulsar misses timing in all 3 instances. It's just like why you can't use Lightpulsar to synchro with and get D-Metal back.

e.g. Dragunity Phalanx and Lightpulsar on field, synchro for scrap dragon, grab D-Metal, D-Metal grab Pulsar, scrap hit Pulsar and opponent's card, pulsar effect grab another D-Metal, summon Pulsar. 28,28,28,25. Konami issued a miss timing rule with Lightpulsar Dragon.