Leon was pretty sure that Gisela didn't tell her background to anyone. So, the chances of Lennart really be her little brother was high. Anyway, he just had to call Betty and confirm things with her, Gisela and Betty mostly spend their afternoons practicing magic together, after all.
"I met her by chance in New York..." Leon said. "Perhaps if you help me, I will lead to where she is... Anyway, you know what you need to do."
After that, Leon ended the call. Before confirming Lennart's identity, he had to deal with Seiji's spies. He was a traitor, but he was a warrior too. So, it took quite a while before he finally gave up and decided to obey Leon's orders. Leon didn't feel pleasure in torturing someone, but he had to do the dirty work. He couldn't let the princess of Japan do such a thing.