it's to cramped in there for the two of you... someone needs to make room.
you're busied taking off your boots, making yourself comfortable, and signalling
that you're not in the mood for traveling... and that cowpoke is pouring some
coffee, also not ready to move on.
the third person appears to be an observer, perhaps prepared to judge a
quick draw contest between you and the tall stranger. maybe he's gonna
"armchair quarterback" the situation.
the main idea is that you've boxed yourself into an uncomfortable spot,
and you're needing to shed yourself of it... like sloughing off tight skin.
"reach for the sky"; "this shed's not big enough...".