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@.Lynx.: Shanks sacrificed his arm to save Luffy. Specifically, Shanks had cast aside his weapons so that he could swim as fast as he could toward where Luffy was being held. So, he had no weapon in which to fight. Added to that, Luffy was literally a split second away from death. So, Shanks threw himself in front of Luffy, thus protecting the boy, but in the process his arm ended up being bitten off in that split second that Shanks had to act.
In other words, there's nothing really inconsistent about the encounter. It's the difference between pushing someone out of the way of a gunmen before they fire their gun, versus pushing someone out of the way as the gunmen shoots. In one instance, both protector and protectee have a high chance of emerging unharmed, but in the other instance, the chance of someone getting hurt rises dramatically. The Sea King was a loaded gun that had already fired. So, of course, someone was hurt.
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