Can this be done and if so, how? Let's assume a bear "grabs" a weaker player and decides to make a snack. Can a stronger player intervene to free him? Only focusing on using grapple to break another's grapple.
Pathfinder PF Special Edition, Starfinder Roleplaying Game Subscriber
About the only way to do so is to force the bear to let the player go by doing damage and establishing yourself as a deadly enough threat to make him focus on you.