I know hoping that the bounty hunters lived sounds wrong. I kind of agree. I just didn't know that seeing a person a person really die in the show would bother me so much like it did in the newest episode.
Apparently Genndy Tartakovsky confirmed that the sister was the first human/sentiant being that Jack has killed. Meaning the bounty hunters "The Princess and the bounty hunters" were just badly hurt and unconcious, but not dead.