Not to start a pissing match but any type of representation that 6 months of training will turn you into a steely eyed, butt kicker is a mistake. It offers a false sense of security and isn’t much different than car camping for a weekend and then deciding you’re ready to go Jeremiah Johnson, because afterall its just camping. A few will make it but the majority will fail due in no small part to overconfidence.
Newaza is ground work, and I agree that it’s an integral part of self defense, whether it be Wrestling, Judo, Bjj or Sambo. In the instance of getting your posterior handed to you, were you able to use your MA training? Did you have any previous ground experience?
All my $0.02