"Uh, sir?" said Queenie, raising a hand in objection. "You said you'd leave me alone with Jacob. Are we no longer doing that?"
"I'm afraid I can't allow that at the moment," Grindelwald replied perfidiously, and Jacob fist pumped.
"Why nooooooot?!" whined Queenie.
"Now that Scamander has escaped, your sister and the Muggle are my only links to his expertise. We'll need their help to find the Toenail of Icklibõgg."
"We'll never help you!" declared Jacob. "There's no way you can make us!" By the way, it turns out Jacob doesn't consider trans women to be women and neither should you. This is canon now.
"If you won't help me," said Grindelwald transishly, "then I suppose the alternative is to just leave you here with Queenie."
Jacob considered that. "Exactly what kind of help are we talking about here?"