Describe John's actions with 2 words.?

John is standing alongside a raging river. He hears a scream of HELP and notices an old lady in the river. A young girl is running down the bank of the river yelling for someone to help because that is her grandmother who fell in the river. John goes to jump in the river to try to rescue the lady. Someone else grabs him by the arm and tells him it is too dangerous for him to do it. John pushed the person away and jumps in and amazingly manages to save the older lady without drowning himself.

Use two words that describe John's action. However, you cannot use the following words......heroic, bold, brave or courageous. Well you can use them but you won't win best answer :)