Shayna, who has eaten F/T basically her entire life, and rarely strikes anymore, does something similar. Usually, I shake the rat on the tongs and she waits for me to put it down and then pulls into her house to eat.
Every once in a while, she will grab the rat, pull it into her house, and then not eat it.
Different, but similar behavior. Seemingly interested, but when push comes to shove, they decide not to eat.
Because of this behavior, I do a morning check to see if the rat is gone after feeding night. Nothing worse than opening the tank 2 days later to a rotting rat.