Han Shot First
After Han confronts Beckett shortly after being betrayed, he guns Beckett down before giving him the opportunity for a more Western-style duel. This is a big character-growth moment for Han, but also acts as a meta reference to a scene from Star Wars: Episode IV — A New Hope.
In the original 1977 cut of the film, after being confronted by the bounty hunter Greedo, Han slowly draws his blaster and unexpectedly shoots him dead under the table. One of the more controversial changes made to the 1997 special edition of A New Hope was a slightly different take on this particular encounter.
In an effort to make Han look less like a ruthless killer, several frames were added that make it appear like Greedo shoots at Han and Han only fires back in self-defense. This was changed yet again in 2004 when the scene was altered to make it look like they fire at the same time and Han dodges the shot. In Solo, however, Han is the definitive one to shoot first when threatened.