This brief sequence from Fantastic Comics #9 shows that Samson, while a "powered" hero instead of a "super wizard" hero, was otherwise cut from much the same absolutely merciless mold as Stardust.
Here we see that
And of course, he had the bird under his arm so he could have it carry him away from the island.
So Samson, rather than be willing to let these monsters live, decided he was going to drive them into extinction.
He probably broke the bird's neck later and gave it to somebody as a substitute holiday turkey, too.