A "some random girl who only you an some of her family members care about dying" scenario is not a mayor event. It is easy to fix. Follow her to the lake and do NOT let her leave, even if it means using your own life as a threat
So the MC is retarded. Dude just go to the pond, stall for less than 1 minute after 5:30, boom you saved her. Seriously just grab her hand and don't let go for 1 minute .