[Aaron_S]

Could have been a feeding response still, because they thought opening of the enclosure was bringing food.

Another reason could possibly be you simply startled the snakes. It happens. Especially with nocturnal snakes who may have been awakened suddenly.

Also, if you work for a zoo, and your "senior keeper" tells you to put a NEW animal into an existing enclosure with an already healthy one, why would you not question if you should quarantine or not? Was it WC?

Lastly, to my knowledge, and I may be wrong, Green Tree Python's aren't very active and their metabolism is slower than most snakes, so why would you feed a rat once a week? Seems to me, and again I may be wrong, that it's over feeding.