I have seen it via video and such. And its not limited to one person. There is at least that block out there. Not saying other styles are defacto better than it though, or someone who calls themselves krav maga couldn't have gone to shiv works classes like 20 times.
Thats why the elements of observation and verbal skills etc are generally better with a small introduction physical skillet to get you out of situations you need to fight out of. Maybe more on the physical side than verbal if you arent the type who can ab lib your way out of things as easily.
An emphasis on stun and run is pretty good as well. Or hit first then run. (where it is lawful to do so, not presuming to know the legal status on that in Portugal) Maybe use the small physical skill set they give you to train your aggression as well so you can switch it on and off when you need to. That is a pretty key skill. (which i just forgot about)