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Okay, so if you really want the Talwar, it probably isn't worth putting all your bets on a single turn. However, if you do swap to it, you'll need to spend a turn doing so.
You'll lose 35% (or 30%?) of your block, and that will also affect the next fight, but it probably isn't that critical, as it won't save you from the skeletons anyway.
As for the positioning, everything will be as it was: I'll start with the 6th unit and position the rest as before.