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Wait, you could totally play Witnesses in battle to take Michael out for (effectively) the rest of the game!? XD
A set-aside enhancement is treated as a regular enhancement (for whether it stays in play or is discarded once played), and can be played in battle according to the normal rules of initiative. Set aside enhancements can also be played outside of battle during the preparation phase or discard phase if they are played on a character of matching brigade in the player's territory. Set aside enhancements played outside of battle cannot target cards controlled by an opponent (unless the enhancement is a territory class enhancement).
Sorry to say it but that was a bad ruling based on how things used to be.
... Gabe, John, and Justin all agreed and used something from the regs to justify it.
This is under review.
But both Bill and I are getting up there in years. It's hard to tell with these things.
Oh come on you guys 40's the new 20! :-)