Young and weak, he simply watches what transpires.  He can sense the anger in Jack when the disease spreads.  The hostility is thick around them, and he does nothing but watch.  He does nothing.

When he finally comes back into his own consciousness Jack is shuffling him to a new area to gather uninfected apples.  He hurries along as instructed, with no more than a glance to where his father had left them.  In this dazed state all he hears is murmurs.  Watching Jack grab some apples, he simply mimics it without much thought.  The next thing he knows they are exiting the orchard with quickened steps...