Does Thousand-Tailed Watcher's -3 might effect persist if units are later buffed, or is it a one-time reduction?

Ruling: Thousand-Tailed Watcher gives all enemy units -3 might this turn (down to a minimum of 1 might). If units are later buffed, they gain might from their current value after Watcher's effect. Negative might values below 1 are not stored.

Sequence:

• Watcher reduces all current enemy units by -3 might (minimum 1)
• If a unit would go below 1 might, it stays at 1
• If that unit is later buffed, it gains might starting from 1 (the extra negative values are not stored)

Nuances:

• Extra negative might values that would take a unit below 1 are not stored or tracked for later calculations