That happened to me as well in the last feeding Needless to say I'm sick to my stomach, it was only my 2nd time feeding my new BP).

I'm the one to blame as I was in a hurry and used almost boiling water to thaw/warm it up. The moment I took it out of the bag all the guts just came right out dangling over the rat's head *puke*. Blood was dripping everywhere over the floor(my floor) and the gravels. And my BP didn't even eat it afterward I"m not sure it's because of the blood/smell or because of her shedding. It was 4-5 days since and today I see her eyecap

Lesson learned: NO BOILING WATER!