In Niagara, how to spawn emitter at spawn of other emitter's particles?

I am tinkering around in Niagara and I am not sure how to spawn one emitter at the spawn time and location of the particles of another emitter.

I’ve got both emitters in a system, and I’ve been clicking through add module lists trying to intuit what Niagara wants me to do.

So, just to be simple about it… The system is meant to be one emitter that spawns a bunch of explosion fireballs in a cluster, and from each fireball, I want to emit tendrils. So, the tendrils are the second emitter, and I need to spawn one of these emitters at the center of each flare.

Thanks.