He's flexing those muscles out of anxiety, that he knows he's going on record, lying lying, lying about his criminal, criminal, criminal activities..

Developing nervous tics like that is a legendary indicator someone is anxious about answering questions regarding something they're involved in.

He's flexing those muscles out of anxiety, that he knows he's going on record, lying lying, lying about his criminal, criminal, criminal activities..

Developing nervous tics like that is a legendary indicator someone is anxious about answering questions about something they've been involved in,

they feel is going to or could lead to trouble for them.