def reward_injury_player1_pov(old_state, new_state):
    """
    Reward function from POV of player 1, based on injury/score:
        + reward for damaging player 2
        - reward for receiving damage
    Negate of this is reward for plr2
    """
    plr2_injury_delta = new_state.injuries[1] - old_state.injuries[1]
    plr1_injury_delta = new_state.injuries[0] - old_state.injuries[0]
    reward = plr2_injury_delta - plr1_injury_delta
    reward = reward / 5000
    return reward
