Can Divine Judgment choose enemy units, and how does the selection process work?

Ruling: Divine Judgment can and must choose enemy units if necessary. You must choose 2 units total (not "may" or "up to"), and the card does not specify friendly/enemy units only.

Sequence: (when played on your turn)

• Active player (you) selects 2 units first
• If you control fewer than 2 units, you must select opponent's units to reach 2
• Opponent then selects 2 units from the remaining unchosen units
• All units not selected are destroyed

Nuances:

• You cannot select the same unit twice, but your opponent could choose units you already selected
• Divine Judgment does not target (per rule about objects chosen in whole or in part by other players)
• Since it doesn't target, units can be removed in response without causing the spell to fizzle