"Thanks. We're not stopping there for the day though."

Lupin is so stubborn that he just plows through the dizziness. There are things he has to do that day, no matter how uncomfortable he feels--they're more important. Law's assurance that the rest of the decoys was heartening, but he still wanted to check up on them, as well as others. Pops, Fujiko, Adele, and his other friends that he knew were stranded in the village during the storm.

He smiles ruefully at Luke's question. "Gunshot; I don't recommend it to anyone."

It wasn't a yes or a no, but his sober tone was an indication of the truth.