Hey Aaron
Had a look at first few pages... a few thoughts.
1) You describe Quinn before it is physically possible, she's outside a locked door breaking it down with an axe. Leave the description until she breaks through.
2) You lapse into passive voice, try and keep it active, e.g. she is breaking would be she breaks, she is holding would be she holds.
3) You say Quinn steps through, and then a couple of lines later you say she slowly enters, drop the second one as it's just a repeat.
4) When Noah shouts for her he's not in the cabin, so you could use O.C. (Off Camera) or O.S. (Off Screen), so it would be
NOAH (O.C.)
5) You describe Quinn as exuding confidence and Noah as having a goodness to him... both of these are actually difficult to film, how would we know these things about them? Remember your script is about showing us what can be seen.
6) Some of the dialogue is a little on the nose, i.e. it's describing what we can see anyway, worth re-looking at it and make it less obvious.
You'd nearly lost me at this point as the it seemed to be taking a while to get going and the above issues were slowing the read... and then the phone and her nam, very good twist and grabbed my attention.
7) If the phone is charged to 15% there's no way flicking through a few pictures would drain it, i'd drop it to 5% or lower so it makes it more believable.
she is constantly checking - as before make it active, she checks the phone, or she checks the phone repeatedly. Robert is holding becomes Robert holds etc
9) The Infected need some sort of description, how are they infected and what do they look like?
10) Robert's speech on page 12/13 is a little long
11) How can Quinn be sitting in the same place is Robert has already smashed and overturned the furniture?
12) A second bullet seems a little coincidental... does it need to be just one?
13) I think there needs to be some reason they've come to the cabin, blind luck seems a bit of a cheat.
Overall I think there's something here that is definitely worth a re-write and a polish, there's a decent post apocalypse drama within this.
Anthony