俺がいたから残って戦うのを選択したんだ

[Andromedashun]

けど、俺がいたから残って戦うのを選択したんだ
But because I'm here I'll stay... (?)

 

[Toritoribe]

The subject of 残って戦うのを選択した is not "I".
いた and 選択した are both past.

 

[Andromedashun]

I don't get it. What's the subject? ''You''?

 

[Toritoribe]

I can't answer since I don't know the context as always, you know?

 

[Andromedashun]

Context: The speaker and another party that pilot a robot were surrounded by onis. They beat all the onis but another enemy fleet appear. The speaker panic and tell everyone that they ain't going to make it. A guy of the party says he is pessimistic despite his ''great position''.
Then here are the lines follow:

Speaker: 冷静に状況を分析してると言ってほしい
それよりあんたらは早く逃げる！ここは俺がなんとかする！

おいおい、急に何を言い出すんだ？

Speaker: あんたらは最初から逃げようと思ったら逃げられた。。。
けど、俺がいたから残って戦うのを選択したんだ

 

[Toritoribe]

Yes, the subject is あんたら. It's quite obvious since the preceding sentence clearly states that the topic(= what they are talking about) is あんたら, and it still continues to the next sentence because the topic is not changed yet, as in けど、あんたらは俺がいたから残って戦うのを選択したんだ. Makes sense?

 

[Andromedashun]

So the two sentences was like:
''You could have escaped from the beginning. But you guys chosed to stay and fight because I was here''

 

[Toritoribe]

That's right.