Student or Learner
1) One person get kill is already, whatmore if there is two?
I agree with emsr2d2 and bhaisahab.
Let me try the second part of the sentence.
If there are two people have been killed, what terrible thing will happening soon?
I restructure O.P's sentence and add my own style.
Sorry for inconvenience caused.
Just delete my post is ok if it is too bad.