Can this work? Fire giant falls in acid pit spell, then drop dead fall from conjure dead fall spell on him?

[ElyasRavenwood]

What would happen to a fire giant if he fails his reflex save next to an Acid Pit spell?

How much damage would he take? What if the next round, the wizard who cast the Acid pit spell, then casts a Conjure Dead Fall spell?

Would the conjured dead fall fall into the acid pit created by the acid pit spell?

How much damage would it do to the fir giant in the acid pit? Would the giant get a reflex save?

Thank you

Oh assume the caster is 11 level.

[Captain collateral damage]

That would be 4d6 falling damage from the acid pit, and 1d6 non-lethal because the acid is a yielding surface. then 2d6 acid damage per round. then the dead fall would deal 11d6 or 5d6 bludgeoning damage. RAW the fire giant would get a reflex save because it's on the edge of the deadfall's space, but personally as a GM I would give it a minus or not any save at all depending on what size the deadfall was.

[ElyasRavenwood]

Thank you for your answer