It is surprising, isn’t it? For them both, certainly. What else is a surprise is that the child isn’t attempting to attack him, he doesn’t sense any move to. To say Shimazaki didn’t find this one to be impressive would be a lie, maybe there was some respect, so that’s why he remains amicable here and now. There is wariness just below the surface, but he’s not too worried about the boy he faces now, just the one who he could call on at any moment should he make one wrong move.
“Yes, of course,” he replies, maybe a little too dismissively. Even though he hasn’t really done much to actually properly redeem himself. Not like he’s going to grovel. “I have to say, I expected a much different reaction from you.”