have you tried a burst list with a setting of 1 high, 1 min? then zero out the spawn amount and spawn rate. Alternatively you can limit the max draw count to 1, but for something like an explosion, a nice responsive burst list should work best. also having looked at video, it looks like your emitter is looping. try setting…
Ok, so the burst list thing worked and it's only spawning one now. The loops on the original was set to 1, which is why it was confusing because it was spawning a bunch :/ Oh well, thanks guys!