"I don't know if there's going to be any bringing you back," Thor says. He doesn't -- and as strong-willed and determined as he is to barrel through any obstacle, he can't bring himself to fully cling to that hope. He knows now that belief isn't enough; he believed that it was his fate to kill Thanos, and yet Thanos still stood and the universe was less half its people for Thor's efforts.

"If we get the gauntlet back, it's a possibility, but I'm not sure if the stones can move time back that far easily."

Thor still planned to try.