سؤال مذيل غريب لكن

[مستر محمود جنيدى]

when Hafez and Ramon saved leila ,she told him that Lander is the person who trapped her and stole some artefacts . Dr Hafez said "So it was Lander,was it ?"
My question is "why is the question tag is in the affirmative? " .
It is mentioned in chapter 7 page 40 the last two lines in the page