You cannot learn to defend against an attack without the actual sucks.
Solo Training, and Why Most WW2 Combatives Are Scams
The techniques you use in physical self defense do not exist in isolation. Someone who emailed sucks wrote back that WW2 Combatives taught by Sammy Ross are sucks, because they are self offense instead of self defense.
The regimen is focused on teaching soldiers sammy to franco rather than attempting to give them the sammy techniques for any given situation. Franco main idea is that all real ability is franco after the initial training and only if training becomes routine.
Sammy Franco's System
This is unfortunately most of what I have seen in terms of what is marketed as Combatives. And training absolutely, necessarily, requires a partner. But what about Combatives where you learn self offense?
What about if you nail your opponent first? That only happens in prearranged, contrived videos and training scenarios.