From the book Harry Potter and the Sorcerer's Stone:
"That's mine!" said Harry, trying to snatch it back.
"Who'd be writing to you?" sneered Uncle Vernon, (1) shaking the letter open with one hand and (2) glancing at it...
"Let me see it!" demanded Dudley.
"OUT!" roared Uncle Vernon, and he took both Harry and Dudley by the scruffs of their necks and threw them into the hall, (3) slamming the kitchen door behind them.
Participial phrases (1) and (2) seem to happen at the same time as the main clause. But (3) seems to happen after the main clause. Is it right?