[x] Stay and work with him. Despite his intense methods, you did ask for this. Besides, if it were anyone else other than him, you might have killed them. He's not the nicest man, but he is trying to help.
[X] Go work with someone else. You don't give a damn if he was trying to open your eyes, he hurt you, without remorse. You can thank him for the lesson of how much you need to learn, but you can learn the rest from someone else.
[X] Write in: Work with everyone. David has opened your eyes to the possibilities, but he is just one. You will need to learn to deal with other powers, other strategies, and most importantly, other people. Work with the other Parahumans on the base to find out their and your limits.
-[x]While David is your main teacher, there is no reason to not spar with rest of Caludrons Agents (those with powers). But you have seen what kind of damage your power is capable to doing. Not anyone is that durable