dumbass move of the kit, two guys enter, he has to think about his life and that of his sister.
if he stays calm and hides, worse that can happen is a stolen PS3 and some other material things;
if he acts dumb, like with a sword, the guys might change their plans. either they run away and come back another time when he's not prepared; or draw a weapon and shoot him and his sister. turning a simple "theft" into a double murder. genius.
full marks for being dumb.
either take out the burglars right away,(gun/baseballbat); and call the cops; or run & hide.
chasing them away won't do any good. if they have a "nothing to lose" attitude, they might end up causing serious damage, and not talking about material damage here.