OK. So I was watching this log that was half submerged underwater in a pond. There seemed to be a swarm of what I think are longlegged flies on this log. Then, out of a small crevice, I see this red larva thing crawl out of the log. It sits there for a few seconds, then one fly comes over and starts dragging it away. I turn my head for one second and they are both gone. But I caught it all on camera. I'm putting this in ID request because I don't know whether this would be for the larva or the fly, and I'd like to know what just happened!