Things like this have always made me cringe, but that was even more brutal to watch after having torn my bi. You think it's going to look much more hideous than it does, and that there will be some loud snap, but when it happens it's just a subtle "pop" sound and you feel the muscle let go from the attachment. Like him, I knew what happened immediately.
I was thinking of trying to get back to 405 x 10-12 with my little "comeback", but after seeing that I think I'll cap out at doing 315 x 10-15 on a consistent basis. Once the last rep becomes slowed I'm done. Everything I've been doing since I started again is about higher reps, temp, and time under tension; and since it's working, I see no reason to change things up at my age.
I'd rather look like I'm one of the stronger guys in the gym than try to be one.