where they test the girls by trying to drown them?

通过是否会溺水致死判断女孩是否为女巫
If they died, it meant they were obviously innocent.

如果她们死了说明她们是清白的
If they somehow survived,

如果她们活下来了
they were considered witches and therefore hanged.

就被认为是女巫而要受绞刑
Wonderful. A lose-lose situation.

真厉害横竖都是死
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