When a buffed Stalwart Poro has its might reduced and then gains might from defending, does it lose that might when the buff is spent, even though the current might isn't from the buff?

Ruling: Yes, when you spend the buff, the unit loses 1 might even though its current might total includes might from other sources like the defender designation.

Sequence:

• Watcher sees the Poro at 3 might and its might reduction snapshots to -2 (bringing Poro to 1 might)
• Poro gains the defender designation in combat and its might goes up to 2 might (2 base + 1 buff + 1 shield - 2 watcher)
• When you spend the buff, it goes to 1 might

Nuances:

• The might reduction from effects like Watcher snapshots based on the unit's might when the reduction is applied
• When a buff is spent, the unit loses the might from that buff regardless of what other might modifiers are currently active