[Well, he knew it wasn't going to be that easy.]

I need to be ready for when it comes back. You can supervise - it won't leave your sight. But I need to know how to use it, if it comes down to the wire.

[He struggles with the next few words.] Please. You know I wouldn't ask if it wasn't important. [Indeed, this is the first time he's mentioned it since giving the ring to Tony.]