@roger,
a stab from the dark...
"my inner cv boot ripped and alot of the fluid leaked, shortly after a loud snap and my car slowed to a stop"
it was an inner joint with trouble. sounds like it let go and the driveshaft came apart at the joint.
this leaves only a stub axle held in place by a spring clip into the transaxle.
my guess is the energy of the drive axle coming apart let the stub free itself from the transaxle and it spewed.
if the fluid was red, this would prolly be the case.
either way, at the very least he is gonna need a replacement drive axle, and an output shaft seal would be a good bet as well.
(self-repair still under $100)