誰かに乗り移られちゃう

[Andromedashun]

バカね。
だってその時は周り中みんなエルンスト人なのよ？
誰かに乗り移られちゃうじゃない。

My attempt:
Stupid.
Because that time the ones surrounding him are all Ernst people?
What if there is someone who being possessed?

 

[Toritoribe]

The subject of 乗り移られちゃう is "you/we".

 

[Andromedashun]

What if you being possessed by someone?(?)
I can't get the meaning of the phrase.

 

[Toritoribe]

Just for confirmation, エルンスト人 have an ability to enter into other people's minds/bodies?

 

[Andromedashun]

Just for confirmation, エルンスト人 have an ability to enter into other people's minds/bodies?

Right. One of them (ラルヴァ) has that ability.
In case you need context:
そう言えばさ。アルシグノスを消滅させればラルヴァが消えるってのなら、なんで昔の人は封印した後でそうしなかっただろ？

バカね。
だってその時は周り中みんなエルンスト人なのよ？
誰かに乗り移られちゃうじゃない。

あ。。。そりゃそうか。だから古代エルンスト人の血を引く天音が狙われたんだもんね。

 

[Toritoribe]

I asked if all エルンスト人 have that ability, but the context shows that only ラルヴァ has it and the rest エルンスト人 don't, right?

 

[Andromedashun]

I asked if all エルンスト人 have that ability, but the context shows that only ラルヴァ has it and the rest エルンスト人 don't, right?

You may be right. The story that I interpret so far DID NOT MENTION that all エルンスト人 have that ability.

 

[Toritoribe]

Then, 乗り移られちゃう is passive of adversity. 誰か refers to someone in 周りのエルンスト人, and the agent (the one who enters into other person) is ラルヴァ.

 

[Andromedashun]

I don't really get what you mean by ''passive of adversity''. Can you be more detailed?
What is the object of 乗り移られちゃう? If ラルヴァ is the agent, wouldn't it be ラルヴァに乗り移られちゃうじゃない?

 

[Toritoribe]

Need a word or phrase translated? | Page 528 | Japan Forum

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ラルヴァが誰かに乗り移る
ラルヴァ: subject/agent
誰か: target(the one who is possessed by the subject)

ordinary passive
誰かがラルヴァに乗り移られる
誰か: subject
ラルヴァ: agent

indirect passive/passive of adversity
（昔のエルンスト人がラルヴァに）誰かに乗り移られる
昔のエルンスト人: subject/the one who is adversely affected by the event
ラルヴァ: agent
誰か: target