Crooked_Pool
It's just a friendly banter between the master and his student. Ofcourse Peter already knows that there are pople stronger than him in the world, so, he is just proud and happy about the power upgrade. Think about it, if you suddenly got an A in all your subjects than you are bound to be happy and even become confident. You may even attempt to brag, even though you know that getting those As was just a coincidence. Here, it is Peter's way of bragging a little infront of his master. Thank You for all the love and support! Hope to see you around.