Hi, Clam. Let's check the text of Chandelure (SM - Unified Minds 30/236):
[R] Spirit Burner: 10+
Discard the top 5 cards of your deck. This attack does 60 more damage for each Pokémon you discarded in this way. Then, put any number of [R] Pokémon you discarded in this way onto your Bench.
Without going all the way to the step-by-step in the rules, book, we can tell a lot just from the attack's text.
- Discard the top 5 cards of your deck.
- Next the attack does 60 more damage for each Pokémon you discarded in this way.
- Then, put any number of [R] Pokémon you discarded via the attack onto your Bench.
Three distinct parts to the attack; Incineroar (SM - Unbroken Bonds 29/214) won't hit the field until the third part, which is
after damage has already been done by Spirit Burner.