Trishka tells Gray that if he can figure out a way past the barricade in fifteen seconds (before she does it for him), she'll grant him a wish. If he succeeds, his wish is only that she forgive Ishi for trying to kill her a few minutes earlier. She grudgingly agrees.
Grayson has been trying to redeem himself throughout the game, with mixed success, and with Ishi believing it was just another excuse for more violence. Near the end Ishi finally admits Grayson was truly trying to do right for once and that he was glad to be helping.