You just laid hands on the diamond when he comes down from the ceiling with an wink. He’s all tied up by red string

“Hey cutie, help me will you?” You think about it, but he’s the enemy, but then he says

“I reassure I won’t arrest you?”

So you untie him You put one hand on the diamond but then he presses his hand over yours

“Heh.. i had my fingers crossed!..”