Just to point out some difference here, that is dragging someone down by pulling them off balance with their arm.
Salah was different because he pins the arm, trips him, then rotates his body towards and underneath him to control his fall - thus Salah has no control over his landing. This is why one is a normal thing -
the other is actual techniques you learn in martial arts that I dubious someone just stumbles into and that both MMA trainers and European Judo Union have spoken out about in a similar way.
Btw, it's also a technique in Aikido to break an arm, used against people holding a weapon. You pin the arm so they have no mobility with it to use the weapon and then rotate them into the ground with your weight landing on that arm. The aim is to disarm them with the impact of the fall driving their head and shoulder in the ground, or by immobilizing that arm and potentially breaking it. Steven Segal was a big Aikido practitioner - we should have an Under Siege marathon to see if he did any of this to feck up Tommy Lee Jones.
There is a tutorial on how exactly to do it on youtube - for those reading who want to be Champions League winning defenders one day.