Hard to look at but yes I believe that was a rat attack. If I remember correctly it was an adult rat left in over-night for feeding. Very sad, ball pythons often have no defense against the teeth of a grown rat. Turning the tables here's a pic of my green tree python constricting a rat, note the lower teeth, unlike wild rats whose teeth are ground down by various object they gnaw on, cb rats have teeth that grow out of hand. Btw rats teeth never stop growing and they must grind them down.. Alright so heres the pic: