What is the RAW method of resolving situations where large or larger creatures fall on multiple creatures at once when splitting the damage? I have been just splitting the damage among all involved creatures equally and rounding it down, but Tashas has a strangely specific wording, referring to a 'second creature' making me wonder if that's even close to how it's supposed to work.
Tasha's Falling Creature rules (pg. 170)
If a creature falls into the space of a second creature and neither of them is Tiny, the second creature must succeed on a DC 15 Dexterity saving throw or be impacted by the falling creature, and any damage resulting from the fall is divided evenly between them. The impacted creature is also knocked prone, unless it is two or more sizes larger than the falling creature.