"I can help move the barricades if you need," he offers. He's tired, but not too tired to make himself useful. He and Javert had blocked off the stairs as much as possible earlier to prevent spirits from coming in from the upstairs windows. The Invincible is not as invincible as its name implies with all those extra entrances, after all.

And yeah, he sees that glance toward the bar also, but while Cao Pi can do whatever he wishes, Rosinante intends to abstain. A modest amount of alcohol might fog up his tired brain even more, and that's not going to fly. Instead, he reaches into a pocket to withdraw a cigarette, then offers the pack to Cao Pi in case he's changed his opinion on the things.