“Ready, are you?”
It was Uncle Vernon, still purple-faced, still mustached, still looking furious at the nerve of Harry, carrying an owl in a cage in a station full of ordinary people. Behind him stood Aunt Petunia and Dudley, looking terrified at the very sight of Harry.
“You must be Harry’s family!” said Mrs. Weasley.
“In a manner of speaking,” said Uncle Vernon. “Hurry up, boy, we haven’t got all day.” He walked away.
Harry hung back for a last word with Ron and Hermione.
“See you over the summer, then.”
“Hope you have — er — a good holiday,” said Hermione, looking uncertainly after Uncle Vernon, shocked that anyone could be so unpleasant.
-- Harry Potter and the Sorcerer's Stone by J.K. Rowling
What does "look after" in the context mean? Is she looking at the back of Uncle Vernon?