For the moment he's cleaning his fingernails, making sure I see the razorsharp edge.

He'd been cleaning his fingernails with a wickedly sharp knife.

A man in our row pulled out a knife and cleaned his fingernails.

One of them was cleaning his fingernails with a cut-throat razor.

Then he seemed to relax, and concentrated on cleaning his fingernails with a small knife.

The biker took out a knife and started cleaning his fingernails with it.

One of them started cleaning his fingernails with a long-bladed knife.

He decided it was time to start cleaning his fingernails.

He was cleaning his fingernails with a small pearl-handled knife.

Even after Fix had spoken to him, he went on cleaning his fingernails.