Good choice, Levi - a human walking up to it with a sharp object is always a little bit alarming, even if a scalpel wouldn't do excessive damage to it. Spotting the handle being extended towards it, SecUnit takes it, weighing the options. Its hands are steady and it trusts its own ability to keep from using too much force and accidentally stabbing itself, but the leverage it has on its own arm isn't great, either.

It also doesn't want to see how easily its fingers can be reattached here.

"Start up at the joint," SecUnit says, holding back out the scalpel. Once Levi takes the blade back it pulls up the sleeve, to expose the part of the shell still collected by the elbow.