It probably says something that Psionic finally makes a comment about Foster that the man actually doesn't hate and he still thinks of it as a mistake.

What kind of something is still unclear, but now that he's not being swept up in a dance he wasn't planning on or acquiring incremental amounts of new brain damage... he wonders why Psi picked him to try and dance with to begin with.

He waves away the offered hand, picking himself up off the floor somewhat clumsily--but successfully. And once upright....

".... you're working up the nerve to dance with Ginko, then?"