Jack looked into Elma's eyes with a complicated expression on his face. He knew that the operation would be successful however he didn't know how he should tell her about it.
He can't say that he has asked with his truth meter as Elma didn't know about his power and Jack didn't wanna tell her about his Ero Meter.
After thinking for some time Jack sighed and placed his hand on her shoulder and looked her in the eyes.
"You have to trust me. I promise that I will get out of this operation alive." Jack said with a serious tone.
He needed this operation and for that, he would have to persuade Elma.
And he also has to hide the fact that he knows for sure that he will get out of this successfully because his truth meter told him.
And this was a hard thing for him to do, he couldn't come up with a valid excuse right now, he could only tell her to trust him in his decision and hope that she wouldn't make it hard for him.