The author of the video claims that it’s a bug. Yes and no. Essentially this is not a bug but a result of a bad internet connection. If your connection times out but doesn’t completely log you out of the game (something like a lag spike then everything suddenly speeds up to get back to [...]

I’m not much of a code monkey let alone able to write addons and such but this blue post interested me as I was seeing this event come up once or twice in conversation with some friends of mine that DO write mods.
Yes, UNIT_DIED is fixed for 2.4.2. PLAYER_DEAD works fine. (src)