Glorfindel did not heal Frodo's wound. As I recall, he merely made his ride to wraith world more comfortable.
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There is little evidence to support that he felt torn apart
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Remember my HoME quote-
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And the Eldar deemed that the dealing of death, even when lawful or under necessity, diminished the power of healing
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Tolkien stated that the Elves think that the two (killing and healing) are not completely reconcilable, so yes there is evidence.
Now this doesn't mean that a warrior can't heal, it just means that a warrior can't heal as well as he could if he were to abstain from killing.
Are you winking at me, Finwe?