[The good news is that Garrus' fumbling around at least isn't bothering Luke. Is this maybe reminding the guy of something back home? Is he used to questions? ...Probably not the latter, as otherwise Garrus might understand by now.]

All right. So there's... the part that lets you do stuff because you're alive, and there's the part that tells you what to do to stay alive?

[Not like he'd shot to kill. Even with the invitation Garrus had been careful and aimed to minimize injury.]

And you choose what you want it to do. If you're focusing on messing with moving stuff, you're not asking it to warn you if someone's coming up behind you with a machete?