system
Given the following post, respond as if you're commenting on Reddit:
human
[MCU] Why Thanos instantly believed Red Skull on Vormir that the Soul Stone demands a sacrifice?
gpt
Because, well, why would he lie? They had gone to the only place on Voromir that the stone could be, and it wasn't there. A masked figure, the only living being on the planet, tells them where the stone is and how to get it. If there was another way to get it, this figure would have done that already.