Mirel and Bakar were still confused about the situation.
Neither of them was aware of the suspicion on Master Tobias, and clearly so.
Ravenna prohibited Leandra from sharing this suspicion with Mirel and Bakar, fearing that the two would react badly, and confessed everything to Master Tobias. In order for them to get to the bottom of this, they need to make sure Master Tobias wasn't aware.
Earlier, when Master Tobias came and talked about Bob, he was alerted.
Finding that Bakar and Mirel weren't aware of Bob's disappearance certainly made him aware.
Leandra failed to keep it a secret, but there's no point in lingering on it.
At this point, she should fill in Mirel and Bakar first.
And she did.
"So that's why you asked us to tell our stories again," Mirel leaned back on the cabinet, the strength in his legs disappearing; what Leandra told him made him feel weak. "You wanted us to convince you to believe in Master Tobias."