Klaus only hears the part about the number and pauses, making a surprised noise and they almost run directly into SecUnit as it turns around to leave. They were only gonna ask what it meant about the numbers, but now they're both too close and Klaus is aware it doesn't like touching. "Oh. Hey...buddy." He's careful not to move at that moment before very carefully taking a step back.

"Numbers?" He glances over at the sweatshirt on the ground and then back to SecUnit. "Is this like a...Number Four thing or like...something else." Did they tell it about their original name? They can't remember. But then he thinks to add, "Uh...you don't have to answer that." Unless it wants to, but that part is implied.