[It's unfair to Dirk, and he frowns.]

You already know that, dude. It's why you drew it on my hand.

[Then, more genuine, and perhaps a little pained because it shouldn't be this hard, because he should know his brother better and he shouldn't have to ask]

Was I supposed to tell you that I finally made it to the party you've given up waitin' for me to arrive at?

[He does adjust stance and grip. He notices Dave's weird body language but doesn't comment on it immediately.]