So KB basically told Al and Ed in this episode that if they were to harm his family it would have little to no effect on him, unlike if he was to harm their family/frienRAB which would, it was the whole reason why he went there and to top it off he left them alone after pointing that out to further drive the message through to them, not that Al or Ed would harm them anyway, looks like all this stuff in the north is going to get heated soon too.