Exactly. He loves Lottie and was TRYING not to yell at her for being dumb. She asked him to let it out and he did. And given her defense was “I was young and I solved a case so it’s okay”, dosen’t exactly help. His comment about Sensei is insenstive.. but his expressoin is less razzing her for it and more sheer disbelief at the number of bad outcomes caused by this one event, with Shauna stopping him from continuing as Lottie feels bad enough.