"I couldn't?" Jack said. He still hadn't moved from in front of the door, which meant Robby was also keeping him from taking his damn leg off. He wasn't about to do that if he needed to be able to move around and he definitely wanted to be able to move around right now. "Really? Why couldn't I have assumed that you'd miss my birthday after you 'haven't been present'?"

Robby saying he "hadn't been present" was like saying the ocean "was a little wet", and Jack was not interested in cutting him any slack until he started actually explaining himself.