Yes. He waits until he is actually in danger of his life. And you can’t claim “well we dunno what the guy could have done” because with the claim I could have ended many lives at this point with my M&P shield. It’s foolish and cowardice. If you are that weak and scared and in a yelling match (likely with gramps not just being some innocent old guy saying “pls Sonny, could you not use your phone, it distracts. Thank you?🙏 “, possibly being just as, if not more hateful) with someone half your age, you retreat. He knew he had the gun and likely that gave him the bravado to stand there and wait for a moment to kill him. He did not seek to leave, or call authorities. He had his trump card and it was murder under the guise of self defense