Awesome! When these things happen you just have to go with it... red lego and all... =D
It's fascinating to me that this coral has been in captivity for quite some time, and many generations of frags... yet something you did made it spawn. Not too many reefkeepers can say that.
I've been in the hobby 18 years and in my tanks i've had many species of snails, green star polyp, Tridacna maxima, and T. squamosa spawn... but never any SPS.