Each titan is unique. Each titan will most likely kill you on your first encounter. They each need one hit from your solitary arrow to be defeated, but they will not make it easy for you to get that shot in. They'll bounce around, slide around, roll on top of you, shoot beams at you, and smash you into the ground as if you were a pesky fly. By rolling around and learning which direction to move at the right time, your chances of survival increase tremendously. With only one arrow, you need to make your shot count. Fortunately, if you miss your shot, you can call back your arrow or pick it up if it happens to be under your feet. Every titan has a weak spot. That weak spot may only be vulnerable for less than a second at a time, and careful observation with well-timed trial-and-error shots reveal the opportunity to strike.