yeah I never mess with my snakes when they are feeding. Only onece and that was because she broke the rats spine but some how didn't kill it??? it was still breathing as she was swalowing it and she was having a hard time with it. So i grabed the rats tail and moved it slowly and she re-coiled and killed it. After that it was OK and she ate it.

Other then that I leave the tank as it is when a snake starts eating.