Uranium235
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Either Ment is so good that both Mafia players ulted him at once.
Or Lee's second ult target is alive but not shown at all. There are only two possibilities here, and both are questionable: Zero, who has no defense reduction, and the Lover on a date.
Update: It could also be Nancy, who has taken defense against both physical and psychic attacks. But the description doesn't really suggest that scenario.