But the unsub didn't submerge the victims in water to torture them.

不明嫌犯把她们浸入水中不是为了折磨
It was some sort of a test?

而是某种试验
With death being the only possible outcome.

死亡是唯一可能的结果
If he believes he's killing witches,

如果他觉得自己是在杀女巫
he probably thinks that he's a vigilante

他很可能认为自己是个保护者
or a protector against evil of some sort.

有责任抵抗某种恶魔
Laying the victims out the way

让被害人那样躺着
he did could be a message to the devil.

可能是要对恶魔传达的某种信息
A symbol of victory and a warning,

一种胜利和警告的象征
like putting a head on a spike.

就像把头插在尖刺上
He's not worshiping the devil.

他不是崇拜恶魔
He's trying to fight him.

而是要对抗它