[ Knives has figured out a lot already. More than he would have had he not immediately lashed out at arrival. He's not necessarily happy about how he's being restrained, but at the moment - he has no idea how to combat it beyond additional rage and lashing out. Which doesn't work, anyway. So he'll have to find other answers.

He tries not to show his frustration. Buried beneath a mask of that small hint of amusement he continues to wear. ]

Why I find it funny? [ That's easy. ] We spent all that time apart, and yet when we come together - we get brought here. I thought we'd be separated again. But look at that.

[ As for his question -- ]

I plan on only learn about this place and its inhabitants. What else could I be planning to do, Vash? Why? Are you eager to stick your neck out for people who wouldn't think of you twice?

[ If he knows his brother at all, he knows Vash is eager to save someone or another's life. The easiest way to get his twin's attention would be to threaten the life of another. ]