Originally Posted by Nuked
She can't. Some people on here want to think she's super smart, but she's still a little girl.
Well, she is smart. All that means is that she can understand things faster than the average person her age. It doesn't mean she knows everything, or never makes mistakes.
That said, I think you're right. She may understand that a person can die and good things can happen as a result, but I don't think she'd be able to predict it to the point that she would make that decision so quickly (six seconds is not much time). She doesn't even like you killing the St. Johns, for crying out loud, even after all they did to your group.
So no, I don't think Clem would do that, especially since that wouldn't even help the situation she's in. Stevie is dropping the ampule, so she let's go? Why would that make Steve suddenly think "okay, get the vaccine then"? In the heat of the moment, he would instinctively reach out for Clem if she starts falling. It would take too long for him to process what is going on, so he wouldn't be able to catch the vaccine anyway, losing both.