Not so. You cant simply say you feared for your life. Your belief has to be a reasonable fear for your life, otherwise any physical altercation, or even a severe verbal one, merits a deadly response. I don't see how anyone watches that video and deems the shooter's reaction to be based on a reasonable fear for his life, especially considering that he instigated the incident.
Yes, you can simply state that you feared for you life. At that point if charges are brought, it would be up the the jury to decide if Drejka's fear was reasonable in that moment. Note that this is different than what you as a juror think he should have believed.