now , this wouldnt normally be a problem for us because our antibodies would start to eliminate the confused antibodies before they could take hold and produce any negative side-effects but when a blood transfusion occurs and so much of the messed up antibodies are dumped into a superior at one time , well , the vampires antibodies started to think maybe there was a foreign attacker so it looked around and sure enough there was another foreign invader inside , lying there siphoning off some of the vampires necessary blood the baby .