I took it to mean he intended to STOP the intruder.
OK, respectfully to Chris and mister, I concur he wanted to STOP the intruder, but I believe he chose to do so by inflicting a less than lethal wound; thus he lowered his gun. The link below says the intruder suffered an abdominal wound and is NOT deceased. In watching the video, I think most would agree the shooting occurred at very close range and the opportunity to inflict an immediate mortal wound was certainly significant.
http://www.mysanantonio.com/news/metro/stories/MYSA.070208.1B.guns.3c7c070.html
I believe this is a dangerous mindset for self-defense in the home AND on the street. Should a shooter end up in court, I think this leaves the door wide open for an attorney to argue the shooter didn't actually believe his life was in danger but he chose to employ lethal force anyway. My argument is possibly weakened somewhat by the fact that this occurred in a home, but self-defense cases on the street are far less legal slamdunks than those which occur in a home against an unknown invader. Therein lies the danger.
I'm only arguing Mr. Ayoob's point that if you do not have the right to kill someone, you certainly don't have the right to wound them (paraphrasing). Especially in the case of street shootings and in states which require retreat, this could cause you great harm in civil and criminal court. Shooting to wound can open a Pandora's box for someone with no criminal intent and only trying to legally protect themselves and their families.
I'd like to give the homeowner the benefit of the doubt and say he was considering what was behind his target, but there's really no evidence of that seeing how he stated his family was upstairs. I'm glad he and his family are OK.
Also, previous posters are darn sure right; NEVER do these interviews!!! He still might be facing a civil suit in the future OR another grand jury could certainly be convened. Grand jury shopping by vindictive prosecutors is not unheard of.