I doubt the bounty hunter would've thrown kid friendly explosives. And considering Samurai Jack wasn't on Adult Swim at the time, of course blood wasn't shown. It seemed like they were all killed since none of them look like they were at least breathing to show that they survived. It doesn't change the traumatic Jack would feel from killing the girl in this episode since he was expecting robots and that the girl might still be at the age of a child. If you mean Discord from MLP, then yes. First thought I had when seeing the second Aku was Discord.