Sarge knew something was up the moment he saw Rodeo with that dark cloud looming over his head. To be fair, it's sort of been there for a while now, but it has gotten worse since they found Addie. Sarge has chosen a very passive approach so far, because he knows that no amount of talking can change his best friend's mind right know - even though it nearly kills him to see his brother so miserable, especially when it is so completely unnecessary.
When his phone first buzzes he is tempted not to look at it out of habit, Rodeo is sitting a few feet away from him so it can't be important. Yet he does and frowns, Addie doesn’t really have any reason to text him, especially at this time of night. Completely ignoring the fact that he had just been involved in a conversation he stares at the screen some more before typing a reply, effectively changing his plans for the night from getting drunk and quite possibly laid to picking up his best friend's little sister because they are incapable of communicating like people.
And he does find that ironic.
A little later than expected, thanks to a few scattered walkers he had to dodge, he arrives at the corner Addie suggested, not bothering to kill the engine. Without a word he holds out a helmet and a bandana to help keep the dust at bay, and lets his eyes rest on her weapon of choice appreciatively.
Under different circumstances he would have taken one of their trucks, but he didn't feel like answering any questions. Maybe he regrets that now, because she has to sit on his bike and hold on to him and he generally hates having a passenger. Not just because they usually prove to be dead weight but they also touch him. There is nothing he can do about it now and he figures that he should maybe speak at some point.