However, Red Skull told Hawkeye that Black Widow’s death is permanent. When Hawkeye returns to Earth, Thor (Chris Hemsworth) suggests they use the Time Stone to bring her back. After an extended fight over which one of them will make the big sacrifice, Black Widow jumps to her death.
Black Widow: When Black Widow (Scarlett Johansson) and Hawkeye (Jeremy Renner) go to Voramir, they learn from Red Skull that they will have to sacrifice something they love in order to attain the Soul Stone.