Leone directed some fantastic action, and he did this already in FoD, in all the smaller action scenes, but his big action scenes in FoD and in Giu la testa are only mediocre, and especially Giu suffers from this. But I have to say the same about Django.
In FoD the river massacre and the cemetery shoot-out are pretty lame, and this is not only a result of bad editing. Similar in Django there are some incredibly quick shoot-outs, but the big ones feel pale against them. In fact it was Il mercenario in which he learned how to edit the big action scenes, maybe only thanks his new editor Eugenio Alabiso. But then in Alabiso’s previous Spags this kind of scenes did not work either.
In Giu the directing of the ambush at the bridge is indecisive, and the final battle at the train is also a let-down, which makes it the only Leone western with a weak ending.