BioShock Infinite's 'Siren' warns of reborn enemies

The "heavy hitters" of BioShock Infinite have, so far, been profoundly eerie to look at. The Siren, however, is much creepier to deal with, as it has the power to bring downed enemies back. Oh, and it sings an otherworldly song to raise those enemies, so it's just generally creepy as well.