I am not Doctor Mike, but I may help you on this one.
It is better to feed the snake in a separate enclosure since the snake may swallow some of the substrate in the tank that it is in right now (Eg. Aspen)
Also another thing why you might not want to feed it in it's 'house' is that, everytime you put your hands in there, it might think that it's feeding time instead of play time. This might cause it to strike at you, thinking that you have a food item in your hand. So taking it out and putting it in another container would avoid anything like this. If you take it out, put it in another container, it will know that it's feeding time then instead of the play time.
Hope this helped.
Good Luck and Happy Herping!