Got three questions that involve Machines:

1. Turn player uses Dark Hole to destroy his Lightpulsar Dragon and Card Trooper. He wants to use Lightpulsar's effect. If this is legal, what happens?
2. Player A has a Red Eyes Darkness Metal Dragon equipped with Player B's Blast Sphere. During A's following standby phase, A activates his set Forbidden Lance on his REDMD. What happens?
3. KA-1 Des Scissors + Full-Force Strike: Would Des Scissors's burn effect still happen?

1.) Both are optional effects and both belonging to the turn player, so they can choose to activate/resolve both effects in whatever order they desire.

2.) Blast Sphere would not destroy the equipped monster and no damage will be dealt. Partly because of Blast Sphere being treated as an Equip Magic Card and partly because, based on Blast Sphere's wording, it destroys the equipped monster first and then it goes to the Graveyard following it like any Equip Card does when the monster it's equipped to is no longer face-up on the field, and not the other way around; destroying itself, going to the Graveyard, and then the equipped monster. (In which case, Blast Sphere could be debated as it is now a Monster Card in the Graveyard.)

3.) If you actually destroy the opponent's monster by battle and send it to the Graveyard, the burn will still happen (in which case, using Almighty Blow/Full-Force Strike was a bit pointless, lol). If you don't and you destroy it by the effect of Almighty Blow/Full-Force Strike, then the burn won't happen since, of course, it wasn't destroyed by the battle with KA-2 Des Scissors, but by the effect of Almighty Blow/Full-Force Strike.