i shot a buck last year and had the arrow breakoff. in my case, i hit about 3 inches too far forward and hit him on the shoulder. i had a bunch of crap in the shaft. if you had a gut shot, i would doubt that the arrow broke off. i would think you hit her on a bone. i know when i got myself in the hand there was a bunch of crud in the shaft. after a while everything is gonna smell pretty gross.
slayer