I presumed the back door would not open because it had swelled up because of the heat and jammed, though I cannot imagine Nick closed it as he was leaving with Toyah, so how was it shut. Shona must have kicked the bottom panel of the door out to escape ,although they choose not to show that. Why did Max hesitate instead of following Shona out? They overdramatize scenes like this in Soaps, too much standing about yelling at each other instead of just getting out as quick as they can. Likewise Nick, who seemed to stay in kitchen longer than needed, so Toyah could breathe in more smoke. Then the obligatory ceiling falling down even the the fire had not burned through the joists yet.
Why on earth would Logan choose to walk through the crowd to escape?