I think the Elves being immortal immediately distinguishes themselves from Humans.
I would agree, indubitably.
If it were not for this insane dwarf blacksmith with murder in his past, murder in his present, murder in his veins.
I would have no inclination to believe that an elf might pose as a human, if they were not upright, and verbal.
However, there are elf corpses in the corpse pile, dismiss them with a single hand wave, or toss them somewhere unseen, should I? I do in fact, and in hindsight, see dead elfs, like dead humans. Dead elfs, dead elfs, dead elfs.
I like the thought that they live forever, however, there is no proof that Humans do infact die a permanent death. A DF human's demise may be a phase change, like that of a Caterpillar to the Butterfly. An anthropomorphic shift. The proof is in the pudding, I suppose & that is some blackish pudding.
Now get told, I will. Perform shark dentistry henceforth, by the murmur, by the whisper, by the echo, it only stands to object.
So hark-en to me, thee white coated wizard, with prickly abundance! For I know not what I use, or how its applied, but it is there, to read, but for my eyes, I cannot, I will not. Read aloud, I may push life in, read in quiet, I may pull life out. Shunned from existence, the thoughts, the words, the dark phantoms dance. Death to end the elf, or to restart oneself.
The probes of my master, buzz and whirl. Leave a wee-wee crumb for the future, to twist and turn its fateful approach, he does. A little doubt, often leads to a greater truth.
Sincerely,
Knutor