So, Scuttle sometimes ignores your first hit.
It had like 800 health. You're thinking, "Prepare to get your ass kicked, Franklin! HYAAAAAAA!!!!" But then your first hit SAYS it did something like 53 damage, but the Scuttle still has 800 health --- full health.
This happens a whole lot in my games, but mostly when I play Kayn. No wonder Rhaast hates the little guy. It's a bug or something, but I posted it in Gameplay as well so it gets noticed more easily.