The analyses of a text #2

The protagonist, Philip, who has a club-foot innately, got into a boarding school.
Mr. Watson is the head master.
I don't think think Mr.Rice knows Philip has a club-foot.

In the afternoon they went up to play football, but Mr. Watson stopped Philip on the way out after dinner.
.....................................
The boys went in charge of Mr. Rice, who glanced at Philip and seeing he had not changed, asked why he was not going to play.
"Mr. Watson said I needn't, sir," said Philip.
"Why?"
There were boys all round him, looking at him curiously, and a feeling of shame came over Philip. He looked down without answering. Others gave the reply.
"He's got a club-foot, sir."
"Oh, I see."
Mr. Rice was quite young; he had only taken his degree a year before; and he was suddenly embarrassed. His instinct was to beg the boy's pardon, but he was too shy to do so. He made his voice gruff and loud.
"Now then, you boys, what are you waiting about for? Get on with you."
<Of Human Bondage by Somerset Maugham>
1. I'd like to know what "beg the boy's pardon" here.
2. And I'd like to know what "get on with you" means.
Thank you in advance for your help.