Must the layers of the Prismatic Wall spell be destroyed in order?
You'd think this is answered read-as-written on page 269 of the 5e PHB:
The wall can be destroyed, also one layer at a time, in order from red to violet, by means specific to each layer.
However, I know I've seen multiple people around the internet talk about strategies of intentionally destroying certain layers of their own wall like the red, orange, or indigo layers, and holing up inside the wall and shooting or casting spells through the wall without those layers blocking them.
It also begs a question like "If a fireball hits the wall as part of battle and does 25 damage, does it destroy the blue layer individually?"
I just want some validation that you really do have to hack each layer down from red to violet as opposed to losing middle layers intentionally or unintentionally as part of the overall battle.