It's Possible To Switch a Video Response After It's Made?

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Awhile back, someone made a video response to one of my videos. It wasn't that great, but I thought that was interesting that they posted it as a response. Today I happened to be looking at some similar videos and this person's video came up a related video. So I clicked on, and it said it was a video response... but not to my video anymore, now to someone else's. How did they do that? I'm certain it's the same exact one because I commented on it and my comment is still there. I just found that kind of weird that you can change your mind later and decide now your video is a response to someone else. Not that it's a feature I'd really ever use, I was just curious. I don't usually do video responses unless someone specifically asks me too. I always worry that the person who posted the original might find it rude.