PLAYER 1: What? A harpy carrying an adolescent boy?
GM : She could grab him as an unattended object!
PLAYER 1: It's not a question of how she grabs him! It's a simple question of weight ratios! A Strength 10 harpy cannot carry an eighty pound slave.
GM : Well, it doesn't matter. Please roll initiative.
PLAYER 1: Listen. In order to maintain air-speed velocity, a harpy needs to carry a light load, right?
GM : Please!
PLAYER 1: Am I right?
GM : I'm not interested!
PLAYER 2: It could be carried by an elite harpy!
PLAYER 1: Oh, yeah, an elite harpy maybe, but not a monster manual harpy. That's my point.
PLAYER 2: Oh, yeah, I agree with that.
GM : Will you please roll initiative and prepare for battle?!
PLAYER 1: But then of course a-- elite harpies are all flesh-eating.
PLAYER 2: Oh, yeah.
PLAYER 1: So, they wouldn't really need slaves anyway.
[GM leaves]
PLAYER 2: Wait a minute! Supposing two harpies carried it together?
PLAYER 1: No, they'd have to have it on a line.
PLAYER 2: Well, simple! They'd just use a strand of assassin vine!
PLAYER 1: What, held under the dorsal guiding feathers?
PLAYER 2: Well, why not?