After combat damage is assigned, is there a window to cast action or reaction spells before damage is healed?

Ruling: No, there is no window to cast spells after combat damage is assigned but before damage is healed.

Nuances:

• Damage does not reduce might, so effects that target based on might values (like Foxfire) do not work differently on damaged units
• This applies even in cases where a unit dies in combat and you want to cast a spell before healing resolves