Okay, I watched that left-handed handshake again. When Tessio stands up, he turns to his right to exit and doesn't have the intention of shaking Michael's hand. However, he apparently reconsiders and stops with his body at an angle to the desk behind which Michael sits. It is from that position that he extends his hand. It happens quickly.


"Generosity. That was my first mistake."
"Experience must be our only guide; reason may mislead us."
"Instagram is Twitter for people who can't read."