It all depends on the sensibility of the interviewer and administrators at the school. Personally, if one of my students told me a story about accidentally shooting a pigeon in a box, I would find it funny, pure and simple. Shooting a bully is more of an issue and especially as a first impression, might make me want to talk more to the child and parents, but it wouldn't be a "dealbreaker". However, we live in an age in which a student can be suspended for bringing a chocolate bar to school, an age in which a six-year-old can be charged with sexual harassment. Unfortunately, if you get the wrong teacher (which is easy), there's no room for understanding or a sense of humor.
My advice would be to continue trying to contact the school - don't take no answer for an answer. If someone has a problem with your son's interview, you have a right to hear that problem explained and to initiate a dialogue on the subject.
