I can't give you evidence of this but I have often had a feeling that the hip shot was during the first set of bangs and that the second set were to finish her off .
Outlandish opinion I know but I do just see this as possible
Maybe the blood on the floor disproves this because there should have been more blood unless of course she first fell partly on to the toilet (some blood could have gone down inside the pan and then slipped off after the ricocheted shot to avoid being hit again . I know it doesn't totally add up but neither does OP's version
J MOO