Maybe it was the meanings of his negative arrows that had put him off with his last reply to Tanner's question but Adi himself was confused about his own reasoning. Like what did he just say? Haha.
"Er, I fail to see it too, Professor,'' he admitted, not at all embarrassed to admit his confusion. But a few moments later, he was beginning to understand thanks to his classmates and Tanner herself.
So then him having negative arrows was actually a GOOD thing. Cool! But onto the activity! Gosh, Botros was ancient, yo! Well, Adi knew that but seeing his date of birth... I repeat, Botros was ancient! Hehe. The Hufflepuff now set to work.
Hadn't Tanner said BOTH positive and negative arrows were to be found? Adi could only see a positive one. HUH? Oh, wait! The Zekester had noticed that too. While he waited for the Professor to get to the Lion's question, he scribbled his notes for the positive arrow.