How was that supposed to happen?
Não foi.
Wikipedia deixa isso claro.
David leads Calvin into his pod and launches into space as Miranda launches hers. One of the pods hits debris and is knocked off course. Calvin then lunges at David and attacks him as he struggles to send his pod into deep space, The earthbound pod performs a controlled re-entry and lands in the ocean (probably somewhere in the south pacific) near a boat with two fishermen. As they approach the pod and look inside, it is revealed to be David's...
Note que não diz qual pod está danificado & saiu do curso.
Este é um filme clássico misdirect e cliff-hanger ending . Nós suposto pensamos que o casulo que caiu na Terra é o "seguro" que leva Miranda ... mas não é e a ameaça ainda não acabou