Justified use of force?

Justified use of force?

Flawless home invasion response? Must see security footage. Reading Justified use of force? 1 minute

In addition, to creating premium gun storage solutions and concealment furniture, TimberVaults is committed to helping lawful gun owners think through their own active defense scenarios so that we can be better prepared to protect ourselves and those around us. 
 
This week's good guy with a gun video comes from Houston Texas where a bystander quickly got involved. Was this a terrible mistake or was this justified?