Well remember, an adult wont actually ever hurt a true kitten (i.e. one below 6 months). So its not the kitten that one needs to worry about, its the 14 year old's anxiety level. And indeed, the kitten was showing you its fine by coming right back and trying to be near the big cat. So with that in mind, I think you can safely let it go a bit more while you take your video.
Put another way, the problem with these things isn't violence. Its that the senior cats can stay stress for a long time, and sometimes the stress can be at problematic levels.
Put another way, the problem with these things isn't violence. Its that the senior cats can stay stress for a long time, and sometimes the stress can be at problematic levels.