Dr. Stone Episode 10 -

Watch this comparison of the anime episode and its manga origins to see how Gen's brush with death was adapted:

It is revealed that Magma wants to win the upcoming Grand Bout , a tournament to decide the next village elder. Winning would allow him to marry Ruri , the current priestess, but his true goal is power; he even plots to eliminate Ruri after the marriage. Dr. Stone Episode 10

To prevent Magma from winning and to save Ruri's life, Kohaku begins training Kinro and Ginro for the tournament. Chrome, though initially jealous, sets aside his feelings to focus on helping Senku develop a scientific cure for Ruri’s illness. Watch this comparison of the anime episode and