There's a lot of factors to take into consideration like how big of a fire, how dry are the conditions, which way are the winds blowing the fire, and what elevation are you hunting compared to the fire. Best bet would be to stay well clear of the fire as all the activity around the fire will probably push most the animals away not to mention the chances of a small seemingly harmless fire can turn into a monster before you know whats happening. As a guy that has had to run from a fire or two and have seen how fast a fire can travel I would stay away. Trees crowning and exploding around you tends to not be the funnest thing to do in the woods.