Mac is the Voice of Reason in this discussion. And absolutely right.
There is only defense when there is an offending force. When the threat is gone you cannot continue the violence and still call it defense. You can however hold the (formal) offender until the law enforcement arrives to take over. Although it might seem like a good idea to beat or shoot the crap out of the bad guy, it is not the place of an civilian to be judge, jury and executioner.
And I feel the same as Swanman does when some stranger enters my house uninvited: That person is the enemy and a direct thread. He will be forced down and tie-wrapped asap.